feat(gateway,storage): mosaic gateway doctor with tier health JSON (FED-M1-06)

Adds `mosaic gateway doctor [--json] [--config <path>]` for tier-aware
health reporting (postgres, valkey, pgvector). JSON mode emits a single
parseable TierHealthReport for CI consumption; exit 1 on red.

Refactors gateway-internal tier probes into @mosaicstack/storage so the
same probe logic is reused by both the gateway boot path
(detectAndAssertTier — fail-fast on first failure) and the doctor
command (probeServiceHealth — non-throwing, runs all probes, returns
report). Old apps/gateway/src/bootstrap/tier-detector.* files removed.

A local TierConfig interface in tier-detection.ts captures the minimal
structural shape from MosaicConfig without importing @mosaicstack/config
(would create a cycle since config already depends on storage for
StorageConfig).

Tests:
- packages/storage/src/tier-detection.spec.ts — 22 tests (11 ported from
  gateway tier-detector, 11 new for probeServiceHealth + timing + branch
  coverage)
- packages/mosaic/src/commands/gateway-doctor.spec.ts — 12 tests for
  JSON contract, exit codes, output format, --config override

Refs #460

apps/gateway/package.json

@@ -63,8 +63,10 @@
     "class-validator": "^0.15.1",
     "dotenv": "^17.3.1",
     "fastify": "^5.0.0",
+    "ioredis": "^5.10.0",
     "node-cron": "^4.2.1",
     "openai": "^6.32.0",
+    "postgres": "^3.4.8",
     "reflect-metadata": "^0.2.0",
     "rxjs": "^7.8.0",
     "socket.io": "^4.8.0",

apps/gateway/src/main.ts

@@ -20,10 +20,12 @@ import { Logger, ValidationPipe } from '@nestjs/common';
 import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
 import helmet from '@fastify/helmet';
 import { listSsoStartupWarnings } from '@mosaicstack/auth';
+import { loadConfig } from '@mosaicstack/config';
 import { AppModule } from './app.module.js';
 import { mountAuthHandler } from './auth/auth.controller.js';
 import { mountMcpHandler } from './mcp/mcp.controller.js';
 import { McpService } from './mcp/mcp.service.js';
+import { detectAndAssertTier, TierDetectionError } from '@mosaicstack/storage';
 
 async function bootstrap(): Promise<void> {
   const logger = new Logger('Bootstrap');
@@ -32,6 +34,20 @@ async function bootstrap(): Promise<void> {
     throw new Error('BETTER_AUTH_SECRET is required');
   }
 
+  // Pre-flight: assert all external services required by the configured tier
+  // are reachable. Runs before NestFactory.create() so failures are visible
+  // immediately with actionable remediation hints.
+  const mosaicConfig = loadConfig();
+  try {
+    await detectAndAssertTier(mosaicConfig);
+  } catch (err) {
+    if (err instanceof TierDetectionError) {
+      logger.error(`Tier detection failed: ${err.message}`);
+      logger.error(`Remediation: ${err.remediation}`);
+    }
+    throw err;
+  }
+
   for (const warning of listSsoStartupWarnings()) {
     logger.warn(warning);
   }

docs/federation/TASKS.md

@@ -16,13 +16,13 @@
 Goal: Gateway runs in `federated` tier with containerized PG+pgvector+Valkey. No federation logic yet. Existing standalone behavior does not regress.
 
 | id        | status      | description                                                                                                                                                                                                        | issue | agent  | branch                          | depends_on | estimate | notes                                                                                                                              |
-| --------- | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----- | ------ | ------------------------------- | ---------- | -------- | --------------------------------------------------------------------------------------------------------------------------------- |
+| --------- | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----- | ------ | ------------------------------- | ---------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------- |
 | FED-M1-01 | done        | Extend `mosaic.config.json` schema: add `"federated"` to `tier` enum in validator + TS types. Keep `local` and `standalone` working. Update schema docs/README where referenced.                                   | #460  | sonnet | feat/federation-m1-tier-config  | —          | 4K       | Shipped in PR #470. Renamed `team` → `standalone`; added `team` deprecation alias; added `DEFAULT_FEDERATED_CONFIG`.               |
-| FED-M1-02 | in-progress | Author `docker-compose.federated.yml` as an overlay profile: Postgres 17 + pgvector extension (port 5433), Valkey (6380), named volumes, healthchecks. Compose-up should boot cleanly on a clean machine.          | #460  | sonnet | feat/federation-m1-compose      | FED-M1-01  | 5K       | Bumped PG16→PG17 to match base compose. Overlay defines distinct `postgres-federated`/`valkey-federated` services, profile-gated. |
+| FED-M1-02 | done        | Author `docker-compose.federated.yml` as an overlay profile: Postgres 17 + pgvector extension (port 5433), Valkey (6380), named volumes, healthchecks. Compose-up should boot cleanly on a clean machine.          | #460  | sonnet | feat/federation-m1-compose      | FED-M1-01  | 5K       | Shipped in PR #471. Overlay defines `postgres-federated`/`valkey-federated`, profile-gated, with pg-init for pgvector extension.   |
-| FED-M1-03 | not-started | Add pgvector support to `packages/storage/src/adapters/postgres.ts`: create extension on init (idempotent), expose vector column type in schema helpers. No adapter changes for non-federated tiers.               | #460  | codex  | feat/federation-m1-pgvector     | FED-M1-02  | 8K       | Extension create is idempotent `CREATE EXTENSION IF NOT EXISTS vector`. Gate on tier = federated.                                 |
+| FED-M1-03 | done        | Add pgvector support to `packages/storage/src/adapters/postgres.ts`: create extension on init (idempotent), expose vector column type in schema helpers. No adapter changes for non-federated tiers.               | #460  | sonnet | feat/federation-m1-pgvector     | FED-M1-02  | 8K       | Shipped in PR #472. `enableVector` flag on postgres StorageConfig; idempotent CREATE EXTENSION before migrations.                  |
-| FED-M1-04 | not-started | Implement `apps/gateway/src/bootstrap/tier-detector.ts`: reads config, asserts PG/Valkey/pgvector reachable for `federated`, fail-fast with actionable error message on failure. Unit tests for each failure mode. | #460  | codex  | feat/federation-m1-detector     | FED-M1-03  | 8K       | Structured error type with remediation hints. Logs which service failed, with host:port attempted.                                |
+| FED-M1-04 | done        | Implement `apps/gateway/src/bootstrap/tier-detector.ts`: reads config, asserts PG/Valkey/pgvector reachable for `federated`, fail-fast with actionable error message on failure. Unit tests for each failure mode. | #460  | sonnet | feat/federation-m1-detector     | FED-M1-03  | 8K       | Shipped in PR #473. 12 tests; 5s timeouts on probes; pgvector library/permission discrimination; rejects non-bullmq for federated. |
-| FED-M1-05 | not-started | Write `scripts/migrate-to-federated.ts`: one-way migration from `local` (PGlite) / `standalone` (PG without pgvector) → `federated`. Dumps, transforms, loads; dry-run + confirm UX. Idempotent on re-run.         | #460  | codex  | feat/federation-m1-migrate      | FED-M1-04  | 10K      | Do NOT run automatically. CLI subcommand `mosaic migrate tier --to federated --dry-run`. Safety rails.                            |
+| FED-M1-05 | done        | Write `scripts/migrate-to-federated.ts`: one-way migration from `local` (PGlite) / `standalone` (PG without pgvector) → `federated`. Dumps, transforms, loads; dry-run + confirm UX. Idempotent on re-run.         | #460  | sonnet | feat/federation-m1-migrate      | FED-M1-04  | 10K      | Shipped in PR #474. `mosaic storage migrate-tier`; DrizzleMigrationSource (corrects P0 found in review); 32 tests; idempotent.     |
-| FED-M1-06 | not-started | Update `mosaic doctor`: report current tier, required services, actual health per service, pgvector presence, overall green/yellow/red. Machine-readable JSON output flag for CI use.                              | #460  | sonnet | feat/federation-m1-doctor       | FED-M1-04  | 6K       | Existing doctor output evolves; add `--json` flag. Green/yellow/red + remediation suggestions per issue.                          |
+| FED-M1-06 | in-progress | Update `mosaic doctor`: report current tier, required services, actual health per service, pgvector presence, overall green/yellow/red. Machine-readable JSON output flag for CI use.                              | #460  | sonnet | feat/federation-m1-doctor       | FED-M1-04  | 6K       | Existing doctor output evolves; add `--json` flag. Green/yellow/red + remediation suggestions per issue.                           |
 | FED-M1-07 | not-started | Integration test: gateway boots in `federated` tier with docker-compose `federated` profile; refuses to boot when PG unreachable (asserts fail-fast); pgvector extension query succeeds.                           | #460  | sonnet | feat/federation-m1-integration  | FED-M1-04  | 8K       | Vitest + docker-compose test profile. One test file per assertion; real services, no mocks.                                        |
 | FED-M1-08 | not-started | Integration test for migration script: seed a local PGlite with representative data (tasks, notes, users, teams), run migration, assert row counts + key samples equal on federated PG.                            | #460  | sonnet | feat/federation-m1-migrate-test | FED-M1-05  | 6K       | Runs against docker-compose federated profile; uses temp PGlite file; deterministic seed.                                          |
 | FED-M1-09 | not-started | Standalone regression: full agent-session E2E on existing `standalone` tier with a gateway built from this branch. Must pass without referencing any federation module.                                            | #460  | haiku  | feat/federation-m1-regression   | FED-M1-07  | 4K       | Reuse existing e2e harness; just re-point at the federation branch build. Canary that we didn't break it.                          |

docs/scratchpads/mvp-20260312.md

@@ -343,3 +343,39 @@ Affected files (storage-tier semantics only — Team/workspace usages unaffected
 
 - `MVP-T04` (sync `.mosaic/orchestrator/mission.json`) still deferred.
 - `team` tier rename touches install wizard headless env vars (`MOSAIC_STORAGE_TIER=team`); will need 0.0.x deprecation note in scratchpad if release notes are written this milestone.
+
+---
+
+## Session 17 — 2026-04-19 — claude
+
+**Mode:** Delivery (W1 / FED-M1 execution; resumed after compaction)
+**Branches landed this run:** `feat/federation-m1-tier-config` (PR #470), `feat/federation-m1-compose` (PR #471), `feat/federation-m1-pgvector` (PR #472)
+**Branch active at end:** `feat/federation-m1-detector` (FED-M1-04, ready to push)
+
+**Tasks closed:** FED-M1-01, FED-M1-02, FED-M1-03 (all merged to `main` via squash, CI green, issue #460 still open as milestone).
+
+**FED-M1-04 — tier-detector:** Worker delivered `apps/gateway/src/bootstrap/tier-detector.ts` (~210 lines) + `tier-detector.spec.ts` (12 tests). Independent code review (sonnet) returned `changes-required` with 3 issues:
+
+1. CRITICAL: `probeValkey` missing `connectTimeout: 5000` on the ioredis Redis client (defaulted to 10s, violated fail-fast spec).
+2. IMPORTANT: `probePgvector` catch block did not discriminate "library not installed" (use `pgvector/pgvector:pg17`) from permission errors.
+3. IMPORTANT: Federated tier silently skipped Valkey probe when `queue.type !== 'bullmq'` (computed Valkey URL conditionally).
+
+Worker fix-up round addressed all three:
+
+- L147: `connectTimeout: 5000` added to Redis options
+- L113-117: catch block branches on `extension "vector" is not available` substring → distinct remediation per failure mode
+- L206-215: federated branch fails fast with `service: 'config'` if `queue.type !== 'bullmq'`, then probes Valkey unconditionally
+- 4 new tests (8 → 12 total) cover each fix specifically
+
+Independent verifier (haiku) confirmed all 6 verification claims (line numbers, test presence, suite green: 12/12 PASS).
+
+**Process note — review pipeline working as designed:**
+
+Initial verifier (haiku) on the first delivery returned "OK to ship" but missed the 3 deeper issues that the sonnet code-reviewer caught. This validates the user's "always verify subagent claims independently with another subagent" rule — but specifically with the **right tier** for the task: code review needs sonnet-level reasoning, while haiku is fine for verifying surface claims (line counts, file existence) once review issues are known. Going forward: code review uses sonnet (`feature-dev:code-reviewer`), claim verification uses haiku.
+
+**Followup tasks tracked but deferred:**
+
+- #7: `tier=local` hardcoded in gateway-config resume branches (~262, ~317) — pre-existing bug, fix during M1-06 (doctor) or M1-09 (regression).
+- #8: confirm `packages/config/dist` not git-tracked.
+
+**Next:** PR for FED-M1-04 → CI wait → merge. Then FED-M1-05 (migration script, codex/sonnet, 10K).

eslint.config.mjs

@@ -28,6 +28,7 @@ export default tseslint.config(
             'apps/web/e2e/helpers/*.ts',
             'apps/web/playwright.config.ts',
             'apps/gateway/vitest.config.ts',
+            'packages/storage/vitest.config.ts',
             'packages/mosaic/__tests__/*.ts',
           ],
         },

packages/config/src/index.ts

@@ -5,4 +5,5 @@ export {
   DEFAULT_FEDERATED_CONFIG,
   loadConfig,
   validateConfig,
+  detectFromEnv,
 } from './mosaic-config.js';

packages/config/src/mosaic-config.spec.ts

@@ -1,6 +1,7 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import {
   validateConfig,
+  detectFromEnv,
   DEFAULT_LOCAL_CONFIG,
   DEFAULT_STANDALONE_CONFIG,
   DEFAULT_FEDERATED_CONFIG,
@@ -106,4 +107,64 @@ describe('DEFAULT_* config constants', () => {
     const url = (DEFAULT_FEDERATED_CONFIG.storage as { url: string }).url;
     expect(url).toContain('5433');
   });
+
+  it('DEFAULT_FEDERATED_CONFIG has enableVector=true on storage', () => {
+    const storage = DEFAULT_FEDERATED_CONFIG.storage as {
+      type: string;
+      url: string;
+      enableVector?: boolean;
+    };
+    expect(storage.enableVector).toBe(true);
+  });
+});
+
+describe('detectFromEnv — tier env-var routing', () => {
+  const originalEnv = process.env;
+
+  beforeEach(() => {
+    // Work on a fresh copy so individual tests can set/delete keys freely.
+    process.env = { ...originalEnv };
+    delete process.env['MOSAIC_STORAGE_TIER'];
+    delete process.env['DATABASE_URL'];
+    delete process.env['VALKEY_URL'];
+  });
+
+  afterEach(() => {
+    process.env = originalEnv;
+  });
+
+  it('no env vars → returns local config', () => {
+    const config = detectFromEnv();
+    expect(config.tier).toBe('local');
+    expect(config.storage.type).toBe('pglite');
+    expect(config.memory.type).toBe('keyword');
+  });
+
+  it('MOSAIC_STORAGE_TIER=federated alone → returns federated config with enableVector=true', () => {
+    process.env['MOSAIC_STORAGE_TIER'] = 'federated';
+    const config = detectFromEnv();
+    expect(config.tier).toBe('federated');
+    expect(config.memory.type).toBe('pgvector');
+    const storage = config.storage as { type: string; enableVector?: boolean };
+    expect(storage.enableVector).toBe(true);
+  });
+
+  it('MOSAIC_STORAGE_TIER=federated + DATABASE_URL → uses the URL and still has enableVector=true', () => {
+    process.env['MOSAIC_STORAGE_TIER'] = 'federated';
+    process.env['DATABASE_URL'] = 'postgresql://custom:pass@db.example.com:5432/mydb';
+    const config = detectFromEnv();
+    expect(config.tier).toBe('federated');
+    const storage = config.storage as { type: string; url: string; enableVector?: boolean };
+    expect(storage.url).toBe('postgresql://custom:pass@db.example.com:5432/mydb');
+    expect(storage.enableVector).toBe(true);
+    expect(config.memory.type).toBe('pgvector');
+  });
+
+  it('MOSAIC_STORAGE_TIER=standalone alone → returns standalone-shaped config (not local)', () => {
+    process.env['MOSAIC_STORAGE_TIER'] = 'standalone';
+    const config = detectFromEnv();
+    expect(config.tier).toBe('standalone');
+    expect(config.storage.type).toBe('postgres');
+    expect(config.memory.type).toBe('keyword');
+  });
 });

packages/config/src/mosaic-config.ts

@@ -40,7 +40,11 @@ export const DEFAULT_STANDALONE_CONFIG: MosaicConfig = {
 
 export const DEFAULT_FEDERATED_CONFIG: MosaicConfig = {
   tier: 'federated',
-  storage: { type: 'postgres', url: 'postgresql://mosaic:mosaic@localhost:5433/mosaic' },
+  storage: {
+    type: 'postgres',
+    url: 'postgresql://mosaic:mosaic@localhost:5433/mosaic',
+    enableVector: true,
+  },
   queue: { type: 'bullmq' },
   memory: { type: 'pgvector' },
 };
@@ -119,7 +123,30 @@ export function validateConfig(raw: unknown): MosaicConfig {
 /*  Loader                                                             */
 /* ------------------------------------------------------------------ */
 
-function detectFromEnv(): MosaicConfig {
+export function detectFromEnv(): MosaicConfig {
+  const tier = process.env['MOSAIC_STORAGE_TIER'];
+
+  if (tier === 'federated') {
+    if (process.env['DATABASE_URL']) {
+      return {
+        ...DEFAULT_FEDERATED_CONFIG,
+        storage: {
+          type: 'postgres',
+          url: process.env['DATABASE_URL'],
+          enableVector: true,
+        },
+        queue: {
+          type: 'bullmq',
+          url: process.env['VALKEY_URL'],
+        },
+      };
+    }
+    // MOSAIC_STORAGE_TIER=federated without DATABASE_URL — use the default
+    // federated config (port 5433, enableVector: true, pgvector memory).
+    return DEFAULT_FEDERATED_CONFIG;
+  }
+
+  if (tier === 'standalone') {
     if (process.env['DATABASE_URL']) {
       return {
         ...DEFAULT_STANDALONE_CONFIG,
@@ -133,6 +160,26 @@ function detectFromEnv(): MosaicConfig {
         },
       };
     }
+    // MOSAIC_STORAGE_TIER=standalone without DATABASE_URL — use the default
+    // standalone config instead of silently falling back to local.
+    return DEFAULT_STANDALONE_CONFIG;
+  }
+
+  // Legacy: DATABASE_URL set without MOSAIC_STORAGE_TIER — treat as standalone.
+  if (process.env['DATABASE_URL']) {
+    return {
+      ...DEFAULT_STANDALONE_CONFIG,
+      storage: {
+        type: 'postgres',
+        url: process.env['DATABASE_URL'],
+      },
+      queue: {
+        type: 'bullmq',
+        url: process.env['VALKEY_URL'],
+      },
+    };
+  }
+
   return DEFAULT_LOCAL_CONFIG;
 }
 

packages/db/src/schema.ts

@@ -372,7 +372,11 @@ export const messages = pgTable(
 
 // ─── pgvector custom type ───────────────────────────────────────────────────
 
-const vector = customType<{ data: number[]; driverParam: string; config: { dimensions: number } }>({
+export const vector = customType<{
+  data: number[];
+  driverParam: string;
+  config: { dimensions: number };
+}>({
   dataType(config) {
     return `vector(${config?.dimensions ?? 1536})`;
   },

packages/mosaic/src/commands/gateway-doctor.spec.ts

@@ -0,0 +1,294 @@
+/**
+ * Unit tests for gateway-doctor.ts (mosaic gateway doctor).
+ *
+ * All external I/O is mocked — no live services required.
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import type { TierHealthReport } from '@mosaicstack/storage';
+
+/* ------------------------------------------------------------------ */
+/*  Shared mock state                                                   */
+/* ------------------------------------------------------------------ */
+
+const mocks = vi.hoisted(() => {
+  const mockLoadConfig = vi.fn();
+  const mockProbeServiceHealth = vi.fn();
+  const mockExistsSync = vi.fn();
+
+  return { mockLoadConfig, mockProbeServiceHealth, mockExistsSync };
+});
+
+/* ------------------------------------------------------------------ */
+/*  Module mocks                                                        */
+/* ------------------------------------------------------------------ */
+
+vi.mock('@mosaicstack/config', () => ({
+  loadConfig: mocks.mockLoadConfig,
+}));
+
+vi.mock('@mosaicstack/storage', () => ({
+  probeServiceHealth: mocks.mockProbeServiceHealth,
+}));
+
+vi.mock('node:fs', () => ({
+  existsSync: mocks.mockExistsSync,
+}));
+
+/* ------------------------------------------------------------------ */
+/*  Import SUT                                                          */
+/* ------------------------------------------------------------------ */
+
+import { runGatewayDoctor } from './gateway-doctor.js';
+import type { MosaicConfig } from '@mosaicstack/config';
+
+/* ------------------------------------------------------------------ */
+/*  Fixtures                                                            */
+/* ------------------------------------------------------------------ */
+
+const STANDALONE_CONFIG: MosaicConfig = {
+  tier: 'standalone',
+  storage: { type: 'postgres', url: 'postgresql://mosaic:mosaic@localhost:5432/mosaic' },
+  queue: { type: 'bullmq', url: 'redis://localhost:6380' },
+  memory: { type: 'keyword' },
+};
+
+const GREEN_REPORT: TierHealthReport = {
+  tier: 'standalone',
+  configPath: '/some/mosaic.config.json',
+  overall: 'green',
+  services: [
+    { name: 'postgres', status: 'ok', host: 'localhost', port: 5432, durationMs: 42 },
+    { name: 'valkey', status: 'ok', host: 'localhost', port: 6380, durationMs: 10 },
+    { name: 'pgvector', status: 'skipped', durationMs: 0 },
+  ],
+};
+
+const RED_REPORT: TierHealthReport = {
+  tier: 'standalone',
+  configPath: '/some/mosaic.config.json',
+  overall: 'red',
+  services: [
+    {
+      name: 'postgres',
+      status: 'fail',
+      host: 'localhost',
+      port: 5432,
+      durationMs: 5001,
+      error: {
+        message: 'connection refused',
+        remediation: 'Start Postgres: `docker compose ...`',
+      },
+    },
+    { name: 'valkey', status: 'ok', host: 'localhost', port: 6380, durationMs: 8 },
+    { name: 'pgvector', status: 'skipped', durationMs: 0 },
+  ],
+};
+
+const FEDERATED_GREEN_REPORT: TierHealthReport = {
+  tier: 'federated',
+  configPath: '/some/mosaic.config.json',
+  overall: 'green',
+  services: [
+    { name: 'postgres', status: 'ok', host: 'localhost', port: 5433, durationMs: 30 },
+    { name: 'valkey', status: 'ok', host: 'localhost', port: 6380, durationMs: 5 },
+    { name: 'pgvector', status: 'ok', host: 'localhost', port: 5433, durationMs: 25 },
+  ],
+};
+
+/* ------------------------------------------------------------------ */
+/*  Process helpers                                                     */
+/* ------------------------------------------------------------------ */
+
+let stdoutCapture = '';
+let exitCode: number | undefined;
+
+function captureOutput(): void {
+  stdoutCapture = '';
+  exitCode = undefined;
+
+  vi.spyOn(process.stdout, 'write').mockImplementation((chunk) => {
+    stdoutCapture += typeof chunk === 'string' ? chunk : chunk.toString();
+    return true;
+  });
+  vi.spyOn(process.stderr, 'write').mockImplementation(() => true);
+  vi.spyOn(process, 'exit').mockImplementation((code?: string | number | null) => {
+    exitCode = typeof code === 'number' ? code : code != null ? Number(code) : undefined;
+    throw new Error(`process.exit(${String(code)})`);
+  });
+  vi.spyOn(console, 'log').mockImplementation((...args: unknown[]) => {
+    stdoutCapture += args.join(' ') + '\n';
+  });
+}
+
+/* ------------------------------------------------------------------ */
+/*  Tests                                                               */
+/* ------------------------------------------------------------------ */
+
+describe('runGatewayDoctor', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    captureOutput();
+
+    // By default: no config file on disk (env-detection path)
+    mocks.mockExistsSync.mockReturnValue(false);
+    mocks.mockLoadConfig.mockReturnValue(STANDALONE_CONFIG);
+    mocks.mockProbeServiceHealth.mockResolvedValue(GREEN_REPORT);
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  1. JSON mode: parseable JSON matching the schema                  */
+  /* ---------------------------------------------------------------- */
+
+  it('JSON mode emits parseable JSON matching TierHealthReport schema', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(GREEN_REPORT);
+
+    await runGatewayDoctor({ json: true });
+
+    const parsed = JSON.parse(stdoutCapture) as TierHealthReport;
+    expect(parsed.tier).toBe('standalone');
+    expect(parsed.overall).toBe('green');
+    expect(Array.isArray(parsed.services)).toBe(true);
+    expect(parsed.services).toHaveLength(3);
+
+    // Validate shape of each service check
+    for (const svc of parsed.services) {
+      expect(['postgres', 'valkey', 'pgvector']).toContain(svc.name);
+      expect(['ok', 'fail', 'skipped']).toContain(svc.status);
+      expect(typeof svc.durationMs).toBe('number');
+    }
+
+    // JSON mode must be silent on console.log — output goes to process.stdout only.
+    expect(console.log).not.toHaveBeenCalled();
+  });
+
+  it('JSON mode for federated with 3 ok services', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(FEDERATED_GREEN_REPORT);
+
+    await runGatewayDoctor({ json: true });
+
+    const parsed = JSON.parse(stdoutCapture) as TierHealthReport;
+    expect(parsed.tier).toBe('federated');
+    expect(parsed.overall).toBe('green');
+    expect(parsed.services.every((s) => s.status === 'ok')).toBe(true);
+
+    // JSON mode must be silent on console.log — output goes to process.stdout only.
+    expect(console.log).not.toHaveBeenCalled();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  2. Plain text mode: service lines and overall verdict             */
+  /* ---------------------------------------------------------------- */
+
+  it('plain text mode includes service lines for each service', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(GREEN_REPORT);
+
+    await runGatewayDoctor({});
+
+    expect(stdoutCapture).toContain('postgres');
+    expect(stdoutCapture).toContain('valkey');
+    expect(stdoutCapture).toContain('pgvector');
+  });
+
+  it('plain text mode includes Overall verdict', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(GREEN_REPORT);
+
+    await runGatewayDoctor({});
+
+    expect(stdoutCapture).toContain('Overall: GREEN');
+  });
+
+  it('plain text mode shows tier and config path in header', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(GREEN_REPORT);
+
+    await runGatewayDoctor({});
+
+    expect(stdoutCapture).toContain('Tier: standalone');
+  });
+
+  it('plain text mode shows remediation for failed services', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(RED_REPORT);
+
+    try {
+      await runGatewayDoctor({});
+    } catch {
+      // process.exit throws in test
+    }
+
+    expect(stdoutCapture).toContain('Remediations:');
+    expect(stdoutCapture).toContain('Start Postgres');
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  3. Exit codes                                                     */
+  /* ---------------------------------------------------------------- */
+
+  it('exits with code 1 when overall is red', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(RED_REPORT);
+
+    await expect(runGatewayDoctor({})).rejects.toThrow('process.exit(1)');
+    expect(exitCode).toBe(1);
+  });
+
+  it('exits with code 0 (no exit call) when overall is green', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(GREEN_REPORT);
+
+    await runGatewayDoctor({});
+
+    // process.exit should NOT have been called for green.
+    expect(exitCode).toBeUndefined();
+  });
+
+  it('JSON mode exits with code 1 when overall is red', async () => {
+    mocks.mockProbeServiceHealth.mockResolvedValue(RED_REPORT);
+
+    await expect(runGatewayDoctor({ json: true })).rejects.toThrow('process.exit(1)');
+    expect(exitCode).toBe(1);
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  4. --config path override is honored                              */
+  /* ---------------------------------------------------------------- */
+
+  it('passes --config path to loadConfig when provided', async () => {
+    const customPath = '/custom/path/mosaic.config.json';
+
+    await runGatewayDoctor({ config: customPath });
+
+    // loadConfig should have been called with the resolved custom path.
+    expect(mocks.mockLoadConfig).toHaveBeenCalledWith(
+      expect.stringContaining('mosaic.config.json'),
+    );
+    // The exact call should include the custom path (resolved).
+    const [calledPath] = mocks.mockLoadConfig.mock.calls[0] as [string | undefined];
+    expect(calledPath).toContain('custom/path/mosaic.config.json');
+  });
+
+  it('calls loadConfig without path when no --config and no file on disk', async () => {
+    mocks.mockExistsSync.mockReturnValue(false);
+
+    await runGatewayDoctor({});
+
+    const [calledPath] = mocks.mockLoadConfig.mock.calls[0] as [string | undefined];
+    // When no file found, resolveConfigPath returns undefined, so loadConfig is called with undefined
+    expect(calledPath).toBeUndefined();
+  });
+
+  it('finds config from cwd when mosaic.config.json exists there', async () => {
+    // First candidate (cwd/mosaic.config.json) exists.
+    mocks.mockExistsSync.mockImplementation((p: unknown) => {
+      return typeof p === 'string' && p.endsWith('mosaic.config.json');
+    });
+
+    await runGatewayDoctor({});
+
+    const [calledPath] = mocks.mockLoadConfig.mock.calls[0] as [string | undefined];
+    expect(calledPath).toBeDefined();
+    expect(typeof calledPath).toBe('string');
+    expect(calledPath!.endsWith('mosaic.config.json')).toBe(true);
+  });
+});

packages/mosaic/src/commands/gateway-doctor.ts

@@ -0,0 +1,143 @@
+/**
+ * gateway-doctor.ts — `mosaic gateway doctor` implementation.
+ *
+ * Reports current tier and per-service health (PG, Valkey, pgvector) for the
+ * Mosaic gateway. Supports machine-readable JSON output for CI.
+ *
+ * Exit codes:
+ *   0 — overall green or yellow
+ *   1 — overall red (at least one required service failed)
+ */
+
+import { existsSync } from 'node:fs';
+import { resolve, join } from 'node:path';
+import { homedir } from 'node:os';
+import { loadConfig } from '@mosaicstack/config';
+import { probeServiceHealth } from '@mosaicstack/storage';
+import type { TierHealthReport, ServiceCheck } from '@mosaicstack/storage';
+
+/* ------------------------------------------------------------------ */
+/*  Config resolution                                                   */
+/* ------------------------------------------------------------------ */
+
+const CONFIG_CANDIDATES = [
+  resolve(process.cwd(), 'mosaic.config.json'),
+  join(homedir(), '.mosaic', 'mosaic.config.json'),
+];
+
+/**
+ * Resolve the config path to report in output.
+ *
+ * Priority:
+ *   1. Explicit `--config <path>` flag
+ *   2. `./mosaic.config.json` (cwd)
+ *   3. `~/.mosaic/mosaic.config.json`
+ *   4. undefined — `loadConfig()` falls back to env-var detection
+ *
+ * `loadConfig()` itself already handles priority 1-3 when passed an explicit
+ * path, and falls back to env-detection when none exists.  We resolve here
+ * only so we can surface the path in the health report.
+ */
+function resolveConfigPath(explicit?: string): string | undefined {
+  if (explicit) return resolve(explicit);
+  for (const candidate of CONFIG_CANDIDATES) {
+    if (existsSync(candidate)) return candidate;
+  }
+  return undefined;
+}
+
+/* ------------------------------------------------------------------ */
+/*  Output helpers                                                      */
+/* ------------------------------------------------------------------ */
+
+const TICK = '\u2713'; // ✓
+const CROSS = '\u2717'; // ✗
+const SKIP = '-';
+
+function padRight(s: string, n: number): string {
+  return s + ' '.repeat(Math.max(0, n - s.length));
+}
+
+function serviceLabel(svc: ServiceCheck): string {
+  const hostPort =
+    svc.host !== undefined && svc.port !== undefined ? `${svc.host}:${svc.port.toString()}` : '';
+  const duration = `(${svc.durationMs.toString()}ms)`;
+
+  switch (svc.status) {
+    case 'ok':
+      return `  ${TICK} ${padRight(svc.name, 10)} ${padRight(hostPort, 22)} ${duration}`;
+    case 'fail': {
+      const errMsg = svc.error?.message ?? 'unknown error';
+      return `  ${CROSS} ${padRight(svc.name, 10)} ${padRight(hostPort, 22)} ${duration}  \u2192 ${errMsg}`;
+    }
+    case 'skipped':
+      return `  ${SKIP} ${padRight(svc.name, 10)} (skipped)`;
+  }
+}
+
+function printReport(report: TierHealthReport): void {
+  const configDisplay = report.configPath ?? '(auto-detected)';
+  console.log(`Tier: ${report.tier}  Config: ${configDisplay}`);
+  console.log('');
+
+  for (const svc of report.services) {
+    console.log(serviceLabel(svc));
+  }
+
+  console.log('');
+
+  // Print remediations for failed services.
+  const failed = report.services.filter((s) => s.status === 'fail' && s.error);
+  if (failed.length > 0) {
+    console.log('Remediations:');
+    for (const svc of failed) {
+      if (svc.error) {
+        console.log(`  ${svc.name}: ${svc.error.remediation}`);
+      }
+    }
+    console.log('');
+  }
+
+  console.log(`Overall: ${report.overall.toUpperCase()}`);
+}
+
+/* ------------------------------------------------------------------ */
+/*  Main runner                                                         */
+/* ------------------------------------------------------------------ */
+
+export interface GatewayDoctorOptions {
+  json?: boolean;
+  config?: string;
+}
+
+export async function runGatewayDoctor(opts: GatewayDoctorOptions): Promise<void> {
+  const configPath = resolveConfigPath(opts.config);
+
+  let mosaicConfig;
+  try {
+    mosaicConfig = loadConfig(configPath);
+  } catch (err) {
+    const msg = err instanceof Error ? err.message : String(err);
+    if (opts.json) {
+      process.stdout.write(
+        JSON.stringify({ error: `Failed to load config: ${msg}` }, null, 2) + '\n',
+      );
+    } else {
+      process.stderr.write(`Error: Failed to load config: ${msg}\n`);
+    }
+    process.exit(1);
+  }
+
+  const report = await probeServiceHealth(mosaicConfig, configPath);
+
+  if (opts.json) {
+    process.stdout.write(JSON.stringify(report, null, 2) + '\n');
+  } else {
+    printReport(report);
+  }
+
+  // Exit 1 if overall is red.
+  if (report.overall === 'red') {
+    process.exit(1);
+  }
+}

packages/mosaic/src/commands/gateway.ts

@@ -206,4 +206,15 @@ export function registerGatewayCommand(program: Command): void {
       const { runUninstall } = await import('./gateway/uninstall.js');
       await runUninstall();
     });
+
+  // ─── doctor ─────────────────────────────────────────────────────────────────
+
+  gw.command('doctor')
+    .description('Check gateway tier and per-service health (PG, Valkey, pgvector)')
+    .option('--json', 'Emit TierHealthReport as JSON to stdout (suppresses all other output)')
+    .option('--config <path>', 'Path to mosaic.config.json (defaults to cwd or ~/.mosaic/)')
+    .action(async (cmdOpts: { json?: boolean; config?: string }) => {
+      const { runGatewayDoctor } = await import('./gateway-doctor.js');
+      await runGatewayDoctor({ json: cmdOpts.json, config: cmdOpts.config });
+    });
 }

packages/storage/package.json

@@ -24,7 +24,9 @@
     "@electric-sql/pglite": "^0.2.17",
     "@mosaicstack/db": "workspace:^",
     "@mosaicstack/types": "workspace:*",
-    "commander": "^13.0.0"
+    "commander": "^13.0.0",
+    "ioredis": "^5.10.0",
+    "postgres": "^3.4.8"
   },
   "devDependencies": {
     "typescript": "^5.8.0",

packages/storage/src/adapters/postgres.spec.ts

@@ -0,0 +1,107 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import type { DbHandle } from '@mosaicstack/db';
+
+// Mock @mosaicstack/db before importing the adapter
+vi.mock('@mosaicstack/db', async (importOriginal) => {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const actual = await importOriginal<Record<string, any>>();
+  return {
+    ...actual,
+    createDb: vi.fn(),
+    runMigrations: vi.fn().mockResolvedValue(undefined),
+  };
+});
+
+import { createDb, runMigrations } from '@mosaicstack/db';
+import { PostgresAdapter } from './postgres.js';
+
+describe('PostgresAdapter — vector extension gating', () => {
+  let mockExecute: ReturnType<typeof vi.fn>;
+  let mockDb: { execute: ReturnType<typeof vi.fn> };
+  let mockHandle: Pick<DbHandle, 'close'> & { db: typeof mockDb };
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockExecute = vi.fn().mockResolvedValue(undefined);
+    mockDb = { execute: mockExecute };
+    mockHandle = { db: mockDb, close: vi.fn().mockResolvedValue(undefined) };
+    vi.mocked(createDb).mockReturnValue(mockHandle as unknown as DbHandle);
+  });
+
+  it('calls db.execute with CREATE EXTENSION IF NOT EXISTS vector when enableVector=true', async () => {
+    const adapter = new PostgresAdapter({
+      type: 'postgres',
+      url: 'postgresql://test:test@localhost:5432/test',
+      enableVector: true,
+    });
+
+    await adapter.migrate();
+
+    // Should have called execute
+    expect(mockExecute).toHaveBeenCalledTimes(1);
+
+    // Verify the SQL contains the extension creation statement.
+    // Prefer Drizzle's public toSQL() API; fall back to queryChunks if unavailable.
+    // NOTE: queryChunks is an undocumented Drizzle internal (drizzle-orm ^0.45.x).
+    // toSQL() was not present on the raw sql`` result in this version — if a future
+    // Drizzle upgrade adds it, remove the fallback path and delete this comment.
+    const sqlObj = mockExecute.mock.calls[0]![0] as {
+      toSQL?: () => { sql: string; params: unknown[] };
+      queryChunks?: Array<{ value: string[] }>;
+    };
+    const sqlText = sqlObj.toSQL
+      ? sqlObj.toSQL().sql.toLowerCase()
+      : (sqlObj.queryChunks ?? [])
+          .flatMap((chunk) => chunk.value)
+          .join('')
+          .toLowerCase();
+    expect(sqlText).toContain('create extension if not exists vector');
+  });
+
+  it('does NOT call db.execute for extension when enableVector is false', async () => {
+    const adapter = new PostgresAdapter({
+      type: 'postgres',
+      url: 'postgresql://test:test@localhost:5432/test',
+      enableVector: false,
+    });
+
+    await adapter.migrate();
+
+    expect(mockExecute).not.toHaveBeenCalled();
+    expect(vi.mocked(runMigrations)).toHaveBeenCalledOnce();
+  });
+
+  it('does NOT call db.execute for extension when enableVector is unset', async () => {
+    const adapter = new PostgresAdapter({
+      type: 'postgres',
+      url: 'postgresql://test:test@localhost:5432/test',
+    });
+
+    await adapter.migrate();
+
+    expect(mockExecute).not.toHaveBeenCalled();
+    expect(vi.mocked(runMigrations)).toHaveBeenCalledOnce();
+  });
+
+  it('calls runMigrations after the extension is created', async () => {
+    const callOrder: string[] = [];
+    mockExecute.mockImplementation(() => {
+      callOrder.push('execute');
+      return Promise.resolve(undefined);
+    });
+    vi.mocked(runMigrations).mockImplementation(() => {
+      callOrder.push('runMigrations');
+      return Promise.resolve();
+    });
+
+    const adapter = new PostgresAdapter({
+      type: 'postgres',
+      url: 'postgresql://test:test@localhost:5432/test',
+      enableVector: true,
+    });
+
+    await adapter.migrate();
+
+    expect(callOrder).toEqual(['execute', 'runMigrations']);
+  });
+});

packages/storage/src/adapters/postgres.ts

@@ -66,13 +66,19 @@ export class PostgresAdapter implements StorageAdapter {
   private handle: DbHandle;
   private db: Db;
   private url: string;
+  private enableVector: boolean;
 
   constructor(config: Extract<StorageConfig, { type: 'postgres' }>) {
     this.url = config.url;
+    this.enableVector = config.enableVector ?? false;
     this.handle = createDb(config.url);
     this.db = this.handle.db;
   }
 
+  private async ensureVectorExtension(): Promise<void> {
+    await this.db.execute(sql`CREATE EXTENSION IF NOT EXISTS vector`);
+  }
+
   async create<T extends Record<string, unknown>>(
     collection: string,
     data: T,
@@ -149,6 +155,9 @@ export class PostgresAdapter implements StorageAdapter {
   }
 
   async migrate(): Promise<void> {
+    if (this.enableVector) {
+      await this.ensureVectorExtension();
+    }
     await runMigrations(this.url);
   }
 

packages/storage/src/cli.ts

@@ -1,4 +1,5 @@
 import type { Command } from 'commander';
+import type { MigrationSource } from './migrate-tier.js';
 
 /**
  * Reads the DATABASE_URL environment variable and redacts the password portion.
@@ -209,6 +210,203 @@ export function registerStorageCommand(parent: Command): void {
       }
     });
 
+  // ── storage migrate-tier ─────────────────────────────────────────────────
+
+  storage
+    .command('migrate-tier')
+    .description('Migrate data from tier: local/standalone → tier: federated (Postgres + pgvector)')
+    .requiredOption(
+      '--to <tier>',
+      'Target tier to migrate to (only "federated" is supported)',
+      'federated',
+    )
+    .requiredOption('--target-url <url>', 'Target federated Postgres connection string (required)')
+    .option(
+      '--source-config <path>',
+      'Path to mosaic.config.json (default: cwd/mosaic.config.json)',
+    )
+    .option('--dry-run', 'Print what would be migrated without writing anything')
+    .option('--yes', 'Skip interactive confirmation prompt (required for non-TTY environments)')
+    .option('--batch-size <n>', 'Rows per transaction batch', '1000')
+    .option('--allow-non-empty', 'Allow writing to a non-empty target (upsert — idempotent)')
+    .action(
+      async (opts: {
+        to: string;
+        targetUrl: string;
+        sourceConfig?: string;
+        dryRun?: boolean;
+        yes?: boolean;
+        batchSize?: string;
+        allowNonEmpty?: boolean;
+      }) => {
+        if (opts.to !== 'federated') {
+          console.error(
+            `[migrate-tier] --to "${opts.to}" is not supported. Only "federated" is allowed.`,
+          );
+          process.exitCode = 1;
+          return;
+        }
+
+        const batchSize = parseInt(opts.batchSize ?? '1000', 10);
+        if (isNaN(batchSize) || batchSize < 1) {
+          console.error('[migrate-tier] --batch-size must be a positive integer.');
+          process.exitCode = 1;
+          return;
+        }
+
+        // Redact target URL password for display.
+        function redactUrl(url: string): string {
+          try {
+            const parsed = new URL(url);
+            if (parsed.password) parsed.password = '***';
+            return parsed.toString();
+          } catch {
+            return url.replace(/:([^@/]+)@/, ':***@');
+          }
+        }
+
+        const redactedTarget = redactUrl(opts.targetUrl);
+        const isDryRun = opts.dryRun ?? false;
+        const allowNonEmpty = opts.allowNonEmpty ?? false;
+
+        // Determine source tier from environment.
+        const sourceTier = activeTier();
+        const sourceDesc = configSource();
+
+        console.log('');
+        console.log('[migrate-tier] ─────────────────────────────────────────');
+        console.log(`[migrate-tier] Source tier:  ${sourceTier}`);
+        console.log(`[migrate-tier] Source:       ${sourceDesc}`);
+        console.log(`[migrate-tier] Target tier:  federated (Postgres + pgvector)`);
+        console.log(`[migrate-tier] Target:       ${redactedTarget}`);
+        console.log(`[migrate-tier] Batch size:   ${batchSize.toString()}`);
+        console.log(`[migrate-tier] Dry run:      ${isDryRun.toString()}`);
+        console.log(`[migrate-tier] Allow non-empty: ${allowNonEmpty.toString()}`);
+        console.log('[migrate-tier] ─────────────────────────────────────────');
+        console.log('');
+
+        // Lazy-import core migration logic to keep the CLI thin.
+        const {
+          runMigrateTier,
+          PostgresMigrationTarget,
+          DrizzleMigrationSource,
+          getMigrationOrder,
+        } = await import('./migrate-tier.js');
+
+        // Build source adapter using Drizzle-backed DrizzleMigrationSource.
+        // Both local (PGlite) and standalone (Postgres) sources expose the same
+        // normalized Drizzle schema — this is where the actual domain data lives.
+        let sourceAdapter: MigrationSource;
+        if (sourceTier === 'pglite') {
+          const { createPgliteDb } = await import('@mosaicstack/db');
+          const pgliteDataDir = process.env['PGLITE_DATA_DIR'];
+          if (!pgliteDataDir) {
+            console.error(
+              '[migrate-tier] PGLITE_DATA_DIR is not set. ' +
+                'Cannot open PGlite source — set it to the data directory path.',
+            );
+            process.exitCode = 1;
+            return;
+          }
+          const handle = createPgliteDb(pgliteDataDir);
+          // Local/PGlite sources do not have pgvector registered — the embedding
+          // column is omitted from the insights SELECT and set to null on target.
+          sourceAdapter = new DrizzleMigrationSource(handle.db, /* sourceHasVector= */ false);
+        } else {
+          const { createDb } = await import('@mosaicstack/db');
+          const url = process.env['DATABASE_URL'];
+          if (!url) {
+            console.error('[migrate-tier] DATABASE_URL is not set for postgres source.');
+            process.exitCode = 1;
+            return;
+          }
+          const handle = createDb(url);
+          // Standalone Postgres may or may not have pgvector — assume it does not
+          // (it is a non-federated tier) so embedding is treated as null.
+          sourceAdapter = new DrizzleMigrationSource(handle.db, /* sourceHasVector= */ false);
+        }
+
+        // Print per-table row counts for the confirmation prompt.
+        const tablesToMigrate = getMigrationOrder();
+        const counts: Array<{ table: string; count: number }> = [];
+        for (const table of tablesToMigrate) {
+          const n = await sourceAdapter.count(table);
+          counts.push({ table, count: n });
+        }
+
+        console.log('[migrate-tier] Source row counts:');
+        for (const { table, count } of counts) {
+          console.log(`  ${table}: ${count.toString()}`);
+        }
+        console.log('  sessions: SKIPPED (ephemeral)');
+        console.log('  verifications: SKIPPED (ephemeral)');
+        console.log('  admin_tokens: SKIPPED (environment-specific)');
+        console.log('');
+
+        // Interactive confirmation unless --yes or dry-run.
+        const isTTY = process.stdin.isTTY;
+        if (!isDryRun) {
+          if (!opts.yes && !isTTY) {
+            console.error(
+              '[migrate-tier] Not running in a TTY and --yes was not passed. ' +
+                'Pass --yes to confirm in headless environments.',
+            );
+            process.exitCode = 1;
+            await sourceAdapter.close();
+            return;
+          }
+
+          if (!opts.yes) {
+            const { createInterface } = await import('node:readline');
+            const rl = createInterface({ input: process.stdin, output: process.stdout });
+            const answer = await new Promise<string>((resolve) => {
+              rl.question(`This will WRITE to ${redactedTarget}. Continue? [y/N] `, (ans) => {
+                rl.close();
+                resolve(ans);
+              });
+            });
+            if (answer.trim().toLowerCase() !== 'y') {
+              console.log('[migrate-tier] Aborted.');
+              await sourceAdapter.close();
+              return;
+            }
+          }
+        }
+
+        const target = new PostgresMigrationTarget(opts.targetUrl);
+
+        try {
+          const result = await runMigrateTier(
+            sourceAdapter,
+            target,
+            {
+              targetUrl: opts.targetUrl,
+              dryRun: isDryRun,
+              allowNonEmpty,
+              batchSize,
+              onProgress: (msg) => console.log(msg),
+            },
+            /* sourceHasVector= */ sourceTier === 'postgres',
+          );
+
+          if (result.dryRun) {
+            console.log('[migrate-tier] Dry run complete. No data was written.');
+          } else {
+            console.log(
+              `[migrate-tier] Migration complete. ${result.totalRows.toString()} rows migrated.`,
+            );
+          }
+        } catch (err) {
+          console.error(
+            `[migrate-tier] ERROR: ${err instanceof Error ? err.message : String(err)}`,
+          );
+          process.exitCode = 1;
+        } finally {
+          await Promise.all([sourceAdapter.close(), target.close()]);
+        }
+      },
+    );
+
   // ── storage migrate ──────────────────────────────────────────────────────
 
   storage

packages/storage/src/index.ts

@@ -1,8 +1,29 @@
 export type { StorageAdapter, StorageConfig } from './types.js';
+export { TierDetectionError, detectAndAssertTier, probeServiceHealth } from './tier-detection.js';
+export type { ServiceCheck, TierHealthReport } from './tier-detection.js';
 export { createStorageAdapter, registerStorageAdapter } from './factory.js';
 export { PostgresAdapter } from './adapters/postgres.js';
 export { PgliteAdapter } from './adapters/pglite.js';
 export { registerStorageCommand } from './cli.js';
+export {
+  getMigrationOrder,
+  topoSort,
+  runMigrateTier,
+  checkTargetPreconditions,
+  normaliseSourceRow,
+  PostgresMigrationTarget,
+  DrizzleMigrationSource,
+  SKIP_TABLES,
+  MIGRATION_ORDER,
+  MigrationPreconditionError,
+} from './migrate-tier.js';
+export type {
+  MigrationSource,
+  MigrationTarget,
+  MigrateTierOptions,
+  MigrateTierResult,
+  TableMigrationResult,
+} from './migrate-tier.js';
 
 import { registerStorageAdapter } from './factory.js';
 import { PostgresAdapter } from './adapters/postgres.js';

packages/storage/src/migrate-tier.spec.ts

@@ -0,0 +1,495 @@
+/**
+ * migrate-tier.spec.ts — Unit tests for the migrate-tier core logic.
+ *
+ * These are pure unit tests — no real database connections.
+ * FED-M1-08 will add integration tests against real services.
+ */
+
+import { describe, it, expect, vi } from 'vitest';
+import {
+  getMigrationOrder,
+  topoSort,
+  runMigrateTier,
+  checkTargetPreconditions,
+  normaliseSourceRow,
+  SKIP_TABLES,
+  MigrationPreconditionError,
+  type MigrationSource,
+  type MigrationTarget,
+} from './migrate-tier.js';
+
+/* ------------------------------------------------------------------ */
+/*  Mock factories                                                       */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Build a mock MigrationSource backed by an in-memory table map.
+ * Implements the DrizzleMigrationSource-shaped contract:
+ *   - readTable(tableName, opts?) returns paginated rows
+ *   - count(tableName) returns row count
+ *
+ * The `sourceHasVector` flag controls whether the mock simulates the
+ * no-pgvector projection: when false and tableName is 'insights', rows
+ * are returned WITHOUT the 'embedding' field (matching DrizzleMigrationSource
+ * behaviour for local/PGlite sources).
+ */
+function makeMockSource(
+  data: Record<string, Record<string, unknown>[]>,
+  sourceHasVector = true,
+): MigrationSource & {
+  readTableCalls: Array<{ table: string; opts?: { limit?: number; offset?: number } }>;
+} {
+  const readTableCalls: Array<{ table: string; opts?: { limit?: number; offset?: number } }> = [];
+  return {
+    readTableCalls,
+    readTable: vi.fn(async (tableName: string, opts?: { limit?: number; offset?: number }) => {
+      readTableCalls.push({ table: tableName, opts });
+      let rows = data[tableName] ?? [];
+      // Simulate no-vector projection: omit 'embedding' from insights rows
+      // when sourceHasVector is false (matches DrizzleMigrationSource behaviour).
+      if (tableName === 'insights' && !sourceHasVector) {
+        rows = rows.map(({ embedding: _omit, ...rest }) => rest);
+      }
+      const offset = opts?.offset ?? 0;
+      const limit = opts?.limit ?? rows.length;
+      return rows.slice(offset, offset + limit);
+    }),
+    count: vi.fn(async (tableName: string) => (data[tableName] ?? []).length),
+    close: vi.fn(async () => undefined),
+  };
+}
+
+function makeMockTarget(opts?: {
+  hasPgvector?: boolean;
+  nonEmptyTable?: string;
+}): MigrationTarget & { upsertCalls: Array<{ table: string; rows: Record<string, unknown>[] }> } {
+  const upsertCalls: Array<{ table: string; rows: Record<string, unknown>[] }> = [];
+  const storedCounts: Record<string, number> = {};
+
+  return {
+    upsertCalls,
+    upsertBatch: vi.fn(async (table: string, rows: Record<string, unknown>[]) => {
+      upsertCalls.push({ table, rows });
+      storedCounts[table] = (storedCounts[table] ?? 0) + rows.length;
+    }),
+    count: vi.fn(async (table: string) => {
+      if (opts?.nonEmptyTable === table) return 5;
+      return storedCounts[table] ?? 0;
+    }),
+    hasPgvector: vi.fn(async () => opts?.hasPgvector ?? true),
+    close: vi.fn(async () => undefined),
+  };
+}
+
+function noopProgress(): (msg: string) => void {
+  return () => undefined;
+}
+
+/* ------------------------------------------------------------------ */
+/*  1. Topological ordering                                             */
+/* ------------------------------------------------------------------ */
+
+describe('topoSort', () => {
+  it('returns empty array for empty input', () => {
+    expect(topoSort(new Map())).toEqual([]);
+  });
+
+  it('orders parents before children — linear chain', () => {
+    // users -> teams -> messages
+    const deps = new Map([
+      ['users', []],
+      ['teams', ['users']],
+      ['messages', ['teams']],
+    ]);
+    const order = topoSort(deps);
+    expect(order.indexOf('users')).toBeLessThan(order.indexOf('teams'));
+    expect(order.indexOf('teams')).toBeLessThan(order.indexOf('messages'));
+  });
+
+  it('orders parents before children — diamond graph', () => {
+    // a -> (b, c) -> d
+    const deps = new Map([
+      ['a', []],
+      ['b', ['a']],
+      ['c', ['a']],
+      ['d', ['b', 'c']],
+    ]);
+    const order = topoSort(deps);
+    expect(order.indexOf('a')).toBeLessThan(order.indexOf('b'));
+    expect(order.indexOf('a')).toBeLessThan(order.indexOf('c'));
+    expect(order.indexOf('b')).toBeLessThan(order.indexOf('d'));
+    expect(order.indexOf('c')).toBeLessThan(order.indexOf('d'));
+  });
+
+  it('throws on cyclic dependencies', () => {
+    const deps = new Map([
+      ['a', ['b']],
+      ['b', ['a']],
+    ]);
+    expect(() => topoSort(deps)).toThrow('Cycle detected');
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  2. getMigrationOrder — sessions / verifications excluded           */
+/* ------------------------------------------------------------------ */
+
+describe('getMigrationOrder', () => {
+  it('does not include "sessions"', () => {
+    expect(getMigrationOrder()).not.toContain('sessions');
+  });
+
+  it('does not include "verifications"', () => {
+    expect(getMigrationOrder()).not.toContain('verifications');
+  });
+
+  it('does not include "admin_tokens"', () => {
+    expect(getMigrationOrder()).not.toContain('admin_tokens');
+  });
+
+  it('includes "users" before "teams"', () => {
+    const order = getMigrationOrder();
+    expect(order.indexOf('users')).toBeLessThan(order.indexOf('teams'));
+  });
+
+  it('includes "users" before "conversations"', () => {
+    const order = getMigrationOrder();
+    expect(order.indexOf('users')).toBeLessThan(order.indexOf('conversations'));
+  });
+
+  it('includes "conversations" before "messages"', () => {
+    const order = getMigrationOrder();
+    expect(order.indexOf('conversations')).toBeLessThan(order.indexOf('messages'));
+  });
+
+  it('includes "projects" before "agents"', () => {
+    const order = getMigrationOrder();
+    expect(order.indexOf('projects')).toBeLessThan(order.indexOf('agents'));
+  });
+
+  it('includes "agents" before "conversations"', () => {
+    const order = getMigrationOrder();
+    expect(order.indexOf('agents')).toBeLessThan(order.indexOf('conversations'));
+  });
+
+  it('includes "missions" before "mission_tasks"', () => {
+    const order = getMigrationOrder();
+    expect(order.indexOf('missions')).toBeLessThan(order.indexOf('mission_tasks'));
+  });
+
+  it('includes all expected tables', () => {
+    const order = getMigrationOrder();
+    const expected = [
+      'users',
+      'teams',
+      'accounts',
+      'projects',
+      'agents',
+      'conversations',
+      'messages',
+      'insights',
+    ];
+    for (const t of expected) {
+      expect(order).toContain(t);
+    }
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  3. Dry-run makes no writes                                          */
+/* ------------------------------------------------------------------ */
+
+describe('runMigrateTier — dry-run', () => {
+  it('makes no calls to upsertBatch', async () => {
+    const source = makeMockSource({
+      users: [{ id: 'u1', name: 'Alice', email: 'alice@example.com' }],
+    });
+    const target = makeMockTarget();
+
+    const result = await runMigrateTier(source, target, {
+      targetUrl: 'postgresql://localhost/test',
+      dryRun: true,
+      allowNonEmpty: false,
+      batchSize: 100,
+      onProgress: noopProgress(),
+    });
+
+    expect(target.upsertCalls).toHaveLength(0);
+    expect(result.dryRun).toBe(true);
+    expect(result.totalRows).toBe(0);
+  });
+
+  it('does not call checkTargetPreconditions in dry-run', async () => {
+    // Even if hasPgvector is false, dry-run should not throw.
+    const source = makeMockSource({});
+    const target = makeMockTarget({ hasPgvector: false });
+
+    await expect(
+      runMigrateTier(source, target, {
+        targetUrl: 'postgresql://localhost/test',
+        dryRun: true,
+        allowNonEmpty: false,
+        batchSize: 100,
+        onProgress: noopProgress(),
+      }),
+    ).resolves.not.toThrow();
+
+    // hasPgvector should NOT have been called during dry run.
+    expect(target.hasPgvector).not.toHaveBeenCalled();
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  4. Idempotency                                                       */
+/* ------------------------------------------------------------------ */
+
+describe('runMigrateTier — idempotency', () => {
+  it('produces the same logical row count on second run (upsert semantics)', async () => {
+    const userData = [
+      { id: 'u1', name: 'Alice', email: 'alice@example.com' },
+      { id: 'u2', name: 'Bob', email: 'bob@example.com' },
+    ];
+
+    const source = makeMockSource({ users: userData });
+
+    // First run target.
+    const target1 = makeMockTarget();
+    await runMigrateTier(source, target1, {
+      targetUrl: 'postgresql://localhost/test',
+      dryRun: false,
+      allowNonEmpty: false,
+      batchSize: 100,
+      onProgress: noopProgress(),
+    });
+
+    const firstRunUpserts = target1.upsertCalls.filter((c) => c.table === 'users');
+    const firstRunRows = firstRunUpserts.reduce((acc, c) => acc + c.rows.length, 0);
+
+    // Second run — allowNonEmpty because first run already wrote rows.
+    const target2 = makeMockTarget();
+    await runMigrateTier(source, target2, {
+      targetUrl: 'postgresql://localhost/test',
+      dryRun: false,
+      allowNonEmpty: true,
+      batchSize: 100,
+      onProgress: noopProgress(),
+    });
+
+    const secondRunUpserts = target2.upsertCalls.filter((c) => c.table === 'users');
+    const secondRunRows = secondRunUpserts.reduce((acc, c) => acc + c.rows.length, 0);
+
+    // Both runs write the same number of rows (upsert — second run updates in place).
+    expect(firstRunRows).toBe(userData.length);
+    expect(secondRunRows).toBe(userData.length);
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  5. Empty-target precondition                                        */
+/* ------------------------------------------------------------------ */
+
+describe('checkTargetPreconditions', () => {
+  it('throws when target table is non-empty and allowNonEmpty is false', async () => {
+    const target = makeMockTarget({ nonEmptyTable: 'users' });
+
+    await expect(checkTargetPreconditions(target, false, ['users'])).rejects.toThrow(
+      MigrationPreconditionError,
+    );
+  });
+
+  it('includes remediation hint in thrown error', async () => {
+    const target = makeMockTarget({ nonEmptyTable: 'users' });
+
+    await expect(checkTargetPreconditions(target, false, ['users'])).rejects.toMatchObject({
+      name: 'MigrationPreconditionError',
+      remediation: expect.stringContaining('--allow-non-empty'),
+    });
+  });
+
+  it('does NOT throw when allowNonEmpty is true', async () => {
+    const target = makeMockTarget({ nonEmptyTable: 'users' });
+    await expect(checkTargetPreconditions(target, true, ['users'])).resolves.not.toThrow();
+  });
+
+  it('throws when pgvector extension is missing', async () => {
+    const target = makeMockTarget({ hasPgvector: false });
+
+    await expect(checkTargetPreconditions(target, false, ['users'])).rejects.toMatchObject({
+      name: 'MigrationPreconditionError',
+      remediation: expect.stringContaining('pgvector'),
+    });
+  });
+
+  it('passes when target is empty and pgvector is present', async () => {
+    const target = makeMockTarget({ hasPgvector: true });
+    await expect(checkTargetPreconditions(target, false, ['users'])).resolves.not.toThrow();
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  6. Skipped tables documented                                        */
+/* ------------------------------------------------------------------ */
+
+describe('SKIP_TABLES', () => {
+  it('includes "sessions"', () => {
+    expect(SKIP_TABLES.has('sessions')).toBe(true);
+  });
+
+  it('includes "verifications"', () => {
+    expect(SKIP_TABLES.has('verifications')).toBe(true);
+  });
+
+  it('includes "admin_tokens"', () => {
+    expect(SKIP_TABLES.has('admin_tokens')).toBe(true);
+  });
+
+  it('migration result includes skipped table entries', async () => {
+    const source = makeMockSource({});
+    const target = makeMockTarget();
+
+    const result = await runMigrateTier(source, target, {
+      targetUrl: 'postgresql://localhost/test',
+      dryRun: false,
+      allowNonEmpty: false,
+      batchSize: 100,
+      onProgress: noopProgress(),
+    });
+
+    const skippedNames = result.tables.filter((t) => t.skipped).map((t) => t.table);
+    expect(skippedNames).toContain('sessions');
+    expect(skippedNames).toContain('verifications');
+    expect(skippedNames).toContain('admin_tokens');
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  7. Embedding NULL on migrate from non-pgvector source              */
+/* ------------------------------------------------------------------ */
+
+describe('normaliseSourceRow — embedding handling', () => {
+  it('sets embedding to null when sourceHasVector is false and table is insights', () => {
+    const row: Record<string, unknown> = {
+      id: 'ins-1',
+      content: 'Some insight',
+      userId: 'u1',
+    };
+    const normalised = normaliseSourceRow('insights', row, false);
+    expect(normalised['embedding']).toBeNull();
+  });
+
+  it('preserves existing embedding when sourceHasVector is true', () => {
+    const embedding = [0.1, 0.2, 0.3];
+    const row: Record<string, unknown> = {
+      id: 'ins-1',
+      content: 'Some insight',
+      userId: 'u1',
+      embedding,
+    };
+    const normalised = normaliseSourceRow('insights', row, true);
+    expect(normalised['embedding']).toBe(embedding);
+  });
+
+  it('does not add embedding field to non-vector tables', () => {
+    const row: Record<string, unknown> = { id: 'u1', name: 'Alice' };
+    const normalised = normaliseSourceRow('users', row, false);
+    expect('embedding' in normalised).toBe(false);
+  });
+
+  it('passes through rows for non-vector tables unchanged', () => {
+    const row: Record<string, unknown> = { id: 'u1', name: 'Alice', email: 'alice@test.com' };
+    const normalised = normaliseSourceRow('users', row, false);
+    expect(normalised).toEqual(row);
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  8. End-to-end: correct order of upsert calls                       */
+/* ------------------------------------------------------------------ */
+
+describe('runMigrateTier — migration order', () => {
+  it('writes users before messages', async () => {
+    const source = makeMockSource({
+      users: [{ id: 'u1', name: 'Alice', email: 'alice@test.com' }],
+      messages: [{ id: 'm1', conversationId: 'c1', role: 'user', content: 'Hi' }],
+    });
+    const target = makeMockTarget();
+
+    await runMigrateTier(source, target, {
+      targetUrl: 'postgresql://localhost/test',
+      dryRun: false,
+      allowNonEmpty: false,
+      batchSize: 100,
+      onProgress: noopProgress(),
+    });
+
+    const tableOrder = target.upsertCalls.map((c) => c.table);
+    const usersIdx = tableOrder.indexOf('users');
+    const messagesIdx = tableOrder.indexOf('messages');
+    // users must appear before messages in the upsert call sequence.
+    expect(usersIdx).toBeGreaterThanOrEqual(0);
+    expect(messagesIdx).toBeGreaterThanOrEqual(0);
+    expect(usersIdx).toBeLessThan(messagesIdx);
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  9. Embedding-null projection: no-pgvector source                    */
+/* ------------------------------------------------------------------ */
+
+describe('DrizzleMigrationSource embedding-null projection', () => {
+  it(
+    'when sourceHasVector is false, readTable for insights omits embedding column ' +
+      'and normaliseSourceRow sets it to null for the target insert',
+    async () => {
+      // Source has insights data but no vector — embedding omitted at read time.
+      const insightRowWithEmbedding = {
+        id: 'ins-1',
+        userId: 'u1',
+        content: 'Test insight',
+        embedding: [0.1, 0.2, 0.3], // present in raw data but omitted by source
+        source: 'agent',
+        category: 'general',
+        relevanceScore: 1.0,
+      };
+
+      // makeMockSource with sourceHasVector=false simulates DrizzleMigrationSource
+      // behaviour: the embedding field is stripped from the returned row.
+      const source = makeMockSource(
+        {
+          users: [{ id: 'u1', name: 'Alice', email: 'alice@test.com' }],
+          insights: [insightRowWithEmbedding],
+        },
+        /* sourceHasVector= */ false,
+      );
+      const target = makeMockTarget();
+
+      await runMigrateTier(
+        source,
+        target,
+        {
+          targetUrl: 'postgresql://localhost/test',
+          dryRun: false,
+          allowNonEmpty: false,
+          batchSize: 100,
+          onProgress: noopProgress(),
+        },
+        /* sourceHasVector= */ false,
+      );
+
+      // Assert: readTable was called for insights
+      const insightsRead = source.readTableCalls.find((c) => c.table === 'insights');
+      expect(insightsRead).toBeDefined();
+
+      // Assert: the upsert to insights has embedding === null (not the original vector)
+      const insightsUpsert = target.upsertCalls.find((c) => c.table === 'insights');
+      expect(insightsUpsert).toBeDefined();
+      const upsertedRow = insightsUpsert!.rows[0];
+      expect(upsertedRow).toBeDefined();
+      // embedding must be null — not the original [0.1, 0.2, 0.3]
+      expect(upsertedRow!['embedding']).toBeNull();
+      // Other fields must pass through unchanged
+      expect(upsertedRow!['id']).toBe('ins-1');
+      expect(upsertedRow!['content']).toBe('Test insight');
+    },
+  );
+});

packages/storage/src/migrate-tier.ts

@@ -0,0 +1,697 @@
+/**
+ * migrate-tier.ts — Core logic for `mosaic storage migrate-tier`.
+ *
+ * Migrates data from `tier: local` (PGlite, normalized Drizzle schema) or
+ * `tier: standalone` (Postgres without pgvector) → `tier: federated`
+ * (Postgres + pgvector).
+ *
+ * Source: DrizzleMigrationSource — reads from the NORMALIZED Drizzle/relational
+ *   schema tables (not the flat `id TEXT + data JSONB` PgliteAdapter schema).
+ *   Both local (PGlite) and standalone (Postgres) sources use the same Drizzle
+ *   abstraction via createPgliteDb() or createDb() from @mosaicstack/db.
+ * Target: PostgresMigrationTarget — upserts via raw SQL into the same schema.
+ *
+ * Key design decisions:
+ * - Tables are migrated in topological (FK-dependency) order so that
+ *   parent rows exist before child rows are inserted.
+ * - sessions + verifications are skipped — they are ephemeral / TTL'd.
+ * - adminTokens is skipped — token hashes are environment-specific
+ *   and should be re-issued on the target.
+ * - insights.embedding is omitted from source SELECT when the source lacks
+ *   pgvector (local/PGlite tier); target insert gets NULL for that column.
+ *   insights.embedding is nullable per schema (no .notNull() constraint).
+ * - Each table's batch is wrapped in a transaction for atomicity.
+ * - Upsert semantics (ON CONFLICT DO UPDATE) make re-runs idempotent.
+ *
+ * TODO (FED-M1-08): Add integration tests against real PGlite → real PG.
+ */
+
+import postgres from 'postgres';
+import * as schema from '@mosaicstack/db';
+import { sql as drizzleSql } from '@mosaicstack/db';
+
+/* ------------------------------------------------------------------ */
+/*  Types                                                               */
+/* ------------------------------------------------------------------ */
+
+export interface MigrationSource {
+  /**
+   * Return all rows from a table (normalized Drizzle schema rows).
+   * When sourceHasVector is false and the table has a vector column,
+   * the source MUST omit the vector column from the result and the
+   * caller will set it to null (see normaliseSourceRow).
+   */
+  readTable(
+    tableName: string,
+    opts?: { limit?: number; offset?: number },
+  ): Promise<Record<string, unknown>[]>;
+
+  /** Count rows in a table. */
+  count(tableName: string): Promise<number>;
+
+  /** Close the source connection. */
+  close(): Promise<void>;
+}
+
+export interface MigrationTarget {
+  /**
+   * Upsert a batch of rows into a table.
+   * Must use ON CONFLICT (id) DO UPDATE semantics.
+   */
+  upsertBatch(tableName: string, rows: Record<string, unknown>[]): Promise<void>;
+
+  /**
+   * Count rows in a target table.
+   */
+  count(tableName: string): Promise<number>;
+
+  /**
+   * Check whether pgvector extension is installed.
+   */
+  hasPgvector(): Promise<boolean>;
+
+  /** Close the target connection. */
+  close(): Promise<void>;
+}
+
+export interface MigrateTierOptions {
+  /** Target postgres connection URL. */
+  targetUrl: string;
+  /** Whether to skip all writes (dry-run). */
+  dryRun: boolean;
+  /** Skip the non-empty target guard. */
+  allowNonEmpty: boolean;
+  /** Rows per transaction batch. */
+  batchSize: number;
+  /** Called with progress messages. */
+  onProgress: (msg: string) => void;
+}
+
+export interface TableMigrationResult {
+  table: string;
+  rowsMigrated: number;
+  skipped: boolean;
+  skipReason?: string;
+}
+
+export interface MigrateTierResult {
+  tables: TableMigrationResult[];
+  totalRows: number;
+  dryRun: boolean;
+}
+
+/* ------------------------------------------------------------------ */
+/*  Schema: FK-aware topological table order                           */
+/* ------------------------------------------------------------------ */
+
+/**
+ * SKIP_TABLES: ephemeral or environment-specific tables not worth migrating.
+ *
+ * - sessions: TTL'd auth sessions — invalid in new environment.
+ * - verifications: one-time tokens (email verify, etc.) — already expired.
+ * - admin_tokens: hashed tokens bound to old environment keys — re-issue.
+ */
+export const SKIP_TABLES = new Set(['sessions', 'verifications', 'admin_tokens']);
+
+/**
+ * Topologically ordered table list (parents before children).
+ *
+ * Derived from FK references in packages/db/src/schema.ts:
+ *
+ *   users                 (no FKs)
+ *   teams                 → users
+ *   team_members          → teams, users
+ *   accounts              → users
+ *   projects              → users, teams
+ *   agents                → projects, users
+ *   missions              → projects, users
+ *   tasks                 → projects, missions
+ *   mission_tasks         → missions, tasks, users
+ *   conversations         → users, projects, agents
+ *   messages              → conversations
+ *   preferences           → users
+ *   insights              → users  [has embedding vector column]
+ *   agent_logs            → users
+ *   skills                → users (installedBy, nullable)
+ *   routing_rules         → users (userId, nullable)
+ *   provider_credentials  → users
+ *   appreciations         (no FKs)
+ *   events                (no FKs)
+ *   tickets               (no FKs)
+ *   summarization_jobs    (no FKs)
+ *
+ * Skipped (not in this list):
+ *   sessions              → users  (ephemeral)
+ *   verifications         (no FKs, ephemeral)
+ *   admin_tokens          → users  (environment-specific)
+ */
+export const MIGRATION_ORDER: string[] = [
+  'users',
+  'teams',
+  'team_members',
+  'accounts',
+  'projects',
+  'agents',
+  'missions',
+  'tasks',
+  'mission_tasks',
+  'conversations',
+  'messages',
+  'preferences',
+  'insights',
+  'agent_logs',
+  'skills',
+  'routing_rules',
+  'provider_credentials',
+  'appreciations',
+  'events',
+  'tickets',
+  'summarization_jobs',
+];
+
+/** Tables that carry a vector embedding column on the target. */
+const VECTOR_TABLES = new Set(['insights']);
+
+/* ------------------------------------------------------------------ */
+/*  Utility: derive topological order from an adjacency list           */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Given an adjacency list (table → list of tables it depends on),
+ * return a valid topological ordering (Kahn's algorithm).
+ *
+ * Exposed for unit testing.
+ */
+export function topoSort(deps: Map<string, string[]>): string[] {
+  const nodes = [...deps.keys()];
+  const inDegree = new Map<string, number>();
+  const adjReverse = new Map<string, string[]>();
+
+  for (const node of nodes) {
+    if (!inDegree.has(node)) inDegree.set(node, 0);
+    if (!adjReverse.has(node)) adjReverse.set(node, []);
+    for (const dep of deps.get(node) ?? []) {
+      inDegree.set(node, (inDegree.get(node) ?? 0) + 1);
+      if (!adjReverse.has(dep)) adjReverse.set(dep, []);
+      adjReverse.get(dep)!.push(node);
+    }
+  }
+
+  // Start with nodes that have no dependencies.
+  const queue: string[] = [];
+  for (const [node, deg] of inDegree) {
+    if (deg === 0) queue.push(node);
+  }
+
+  const result: string[] = [];
+  while (queue.length > 0) {
+    const node = queue.shift()!;
+    result.push(node);
+    for (const dependent of adjReverse.get(node) ?? []) {
+      const newDeg = (inDegree.get(dependent) ?? 0) - 1;
+      inDegree.set(dependent, newDeg);
+      if (newDeg === 0) queue.push(dependent);
+    }
+  }
+
+  if (result.length !== nodes.length) {
+    throw new Error('Cycle detected in FK dependency graph');
+  }
+  return result;
+}
+
+/**
+ * Return the migration table order, excluding SKIP_TABLES.
+ * Uses the pre-computed MIGRATION_ORDER (verified against schema.ts).
+ */
+export function getMigrationOrder(): string[] {
+  return MIGRATION_ORDER.filter((t) => !SKIP_TABLES.has(t));
+}
+
+/* ------------------------------------------------------------------ */
+/*  TABLE_OBJECTS: migration table name → Drizzle table object         */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Maps MIGRATION_ORDER table names to their corresponding Drizzle table
+ * objects from the normalized schema.  Used by DrizzleMigrationSource to
+ * execute typed `db.select().from(table)` queries.
+ *
+ * Keyed by snake_case table name (matching MIGRATION_ORDER + SKIP_TABLES).
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const TABLE_OBJECTS: Record<string, any> = {
+  users: schema.users,
+  teams: schema.teams,
+  team_members: schema.teamMembers,
+  accounts: schema.accounts,
+  projects: schema.projects,
+  agents: schema.agents,
+  missions: schema.missions,
+  tasks: schema.tasks,
+  mission_tasks: schema.missionTasks,
+  conversations: schema.conversations,
+  messages: schema.messages,
+  preferences: schema.preferences,
+  insights: schema.insights,
+  agent_logs: schema.agentLogs,
+  skills: schema.skills,
+  routing_rules: schema.routingRules,
+  provider_credentials: schema.providerCredentials,
+  appreciations: schema.appreciations,
+  events: schema.events,
+  tickets: schema.tickets,
+  summarization_jobs: schema.summarizationJobs,
+  // Skipped tables — included so count() works for preflight but never passed
+  // to upsertBatch.
+  sessions: schema.sessions,
+  verifications: schema.verifications,
+  admin_tokens: schema.adminTokens,
+};
+
+/* ------------------------------------------------------------------ */
+/*  DrizzleMigrationSource                                              */
+/* ------------------------------------------------------------------ */
+
+/**
+ * MigrationSource backed by a Drizzle DB handle (works with both
+ * PostgresJsDatabase and PgliteDatabase — they share the same Drizzle
+ * query API for schema-defined tables).
+ *
+ * For the `insights` table (the only vector-column table), when the source
+ * lacks pgvector (local/PGlite tier), the `embedding` column is excluded
+ * from the SELECT projection via a raw `db.execute()` query that lists
+ * only non-vector columns.  This prevents a type-registration error from
+ * PGlite, which does not know the `vector` type.  The caller (runMigrateTier
+ * via normaliseSourceRow) will set embedding to null on the resulting rows.
+ *
+ * Column projection is opt-in: pass `sourceHasVector: false` to activate it.
+ */
+export class DrizzleMigrationSource implements MigrationSource {
+  constructor(
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    private readonly db: any,
+    private readonly sourceHasVector: boolean = true,
+  ) {}
+
+  /**
+   * Columns of the insights table that do NOT include the vector embedding.
+   * Used for the no-pgvector projection path.
+   */
+  private static readonly INSIGHTS_COLUMNS_NO_VECTOR = [
+    'id',
+    'user_id',
+    'content',
+    'source',
+    'category',
+    'relevance_score',
+    'metadata',
+    'created_at',
+    'updated_at',
+    'decayed_at',
+  ] as const;
+
+  async readTable(
+    tableName: string,
+    opts?: { limit?: number; offset?: number },
+  ): Promise<Record<string, unknown>[]> {
+    const table = TABLE_OBJECTS[tableName];
+    if (!table) throw new Error(`DrizzleMigrationSource: unknown table "${tableName}"`);
+
+    // For vector tables when source lacks pgvector: use column-allowlist raw query
+    // to avoid type-registration errors.
+    if (VECTOR_TABLES.has(tableName) && !this.sourceHasVector) {
+      const cols = DrizzleMigrationSource.INSIGHTS_COLUMNS_NO_VECTOR.map((c) => `"${c}"`).join(
+        ', ',
+      );
+      let sql = `SELECT ${cols} FROM "${tableName}"`;
+      const params: unknown[] = [];
+      if (opts?.limit !== undefined) {
+        params.push(opts.limit);
+        sql += ` LIMIT $${params.length.toString()}`;
+      }
+      if (opts?.offset !== undefined) {
+        params.push(opts.offset);
+        sql += ` OFFSET $${params.length.toString()}`;
+      }
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const result = await (this.db as any).execute(
+        // drizzle-orm/pglite and drizzle-orm/postgres-js both accept a raw
+        // SQL template; use the tagged-template sql helper from drizzle-orm.
+        // Since we need dynamic params, we use db.execute with a raw string
+        // via the PGlite/postgres.js driver directly.
+        { sql, params, typings: [] },
+      );
+      // drizzle execute returns { rows: unknown[][] } for PGlite driver,
+      // or a RowList for postgres.js. Normalise both shapes.
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const raw = result as any;
+      if (Array.isArray(raw)) {
+        // postgres.js shape: array of row objects
+        return raw as Record<string, unknown>[];
+      }
+      if (raw?.rows && Array.isArray(raw.rows)) {
+        // PGlite shape: { rows: unknown[][] } OR { rows: Record<string,unknown>[] }
+        const rows = raw.rows as unknown[];
+        if (rows.length === 0) return [];
+        if (Array.isArray(rows[0])) {
+          // Columnar: convert to objects using fields array if available
+          const fields: string[] =
+            (raw.fields as Array<{ name: string }> | undefined)?.map((f) => f.name) ??
+            DrizzleMigrationSource.INSIGHTS_COLUMNS_NO_VECTOR.slice();
+          return (rows as unknown[][]).map((row) => {
+            const obj: Record<string, unknown> = {};
+            for (let i = 0; i < fields.length; i++) {
+              obj[fields[i]!] = row[i];
+            }
+            return obj;
+          });
+        }
+        return rows as Record<string, unknown>[];
+      }
+      return [];
+    }
+
+    // Standard Drizzle select for all other tables (and vector tables when
+    // the source has pgvector registered).
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    let query = (this.db as any).select().from(table);
+    if (opts?.limit !== undefined) query = query.limit(opts.limit);
+    if (opts?.offset !== undefined) query = query.offset(opts.offset);
+    return (await query) as Record<string, unknown>[];
+  }
+
+  async count(tableName: string): Promise<number> {
+    const table = TABLE_OBJECTS[tableName];
+    if (!table) throw new Error(`DrizzleMigrationSource: unknown table "${tableName}"`);
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const [row] = await (this.db as any)
+      .select({ n: drizzleSql<number>`COUNT(*)::int` })
+      .from(table);
+    return (row as { n: number } | undefined)?.n ?? 0;
+  }
+
+  async close(): Promise<void> {
+    // Lifecycle managed externally — caller closes the db handle.
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  Real postgres target adapter                                        */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Live implementation of MigrationTarget backed by a real Postgres connection.
+ * Used by the CLI; mocked in tests.
+ */
+export class PostgresMigrationTarget implements MigrationTarget {
+  private sql: ReturnType<typeof postgres>;
+
+  constructor(url: string) {
+    this.sql = postgres(url, {
+      max: 5,
+      connect_timeout: 10,
+      idle_timeout: 30,
+    });
+  }
+
+  async upsertBatch(tableName: string, rows: Record<string, unknown>[]): Promise<void> {
+    if (rows.length === 0) return;
+
+    // Collect all column names from the batch (union of all row keys).
+    const colSet = new Set<string>();
+    for (const row of rows) {
+      for (const k of Object.keys(row)) colSet.add(k);
+    }
+    const cols = [...colSet];
+    if (!cols.includes('id')) {
+      throw new Error(`Table ${tableName}: rows missing 'id' column`);
+    }
+
+    // Build VALUES list — use postgres tagged-template helpers for safety.
+    // postgres.js supports bulk inserts via array of objects.
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    await this.sql.begin(async (tx: any) => {
+      // Insert in chunks to avoid enormous single queries.
+      for (let i = 0; i < rows.length; i += 500) {
+        const chunk = rows.slice(i, i + 500);
+
+        // Normalise rows: fill missing columns with null.
+        const normalised = chunk.map((row) => {
+          const out: Record<string, unknown> = {};
+          for (const col of cols) {
+            out[col] = row[col] ?? null;
+          }
+          return out;
+        });
+
+        const colList = cols.map((c) => `"${c}"`).join(', ');
+        const updateList = cols
+          .filter((c) => c !== 'id')
+          .map((c) => `"${c}" = EXCLUDED."${c}"`)
+          .join(', ');
+
+        // Build values placeholders
+        const valuePlaceholders = normalised
+          .map((_, ri) => `(${cols.map((_, ci) => `$${ri * cols.length + ci + 1}`).join(', ')})`)
+          .join(', ');
+
+        const flatValues = normalised.flatMap((row) => cols.map((c) => row[c] ?? null));
+
+        const query = `
+          INSERT INTO "${tableName}" (${colList})
+          VALUES ${valuePlaceholders}
+          ON CONFLICT (id) DO UPDATE SET ${updateList}
+        `;
+
+        await tx.unsafe(query, flatValues as never[]);
+      }
+    });
+  }
+
+  async count(tableName: string): Promise<number> {
+    const rows = await this.sql.unsafe(`SELECT COUNT(*)::int AS n FROM "${tableName}"`);
+    const row = rows[0] as unknown as { n: number } | undefined;
+    return row?.n ?? 0;
+  }
+
+  async hasPgvector(): Promise<boolean> {
+    const rows = await this.sql`
+      SELECT 1 FROM pg_extension WHERE extname = 'vector'
+    `;
+    return rows.length > 0;
+  }
+
+  async close(): Promise<void> {
+    await this.sql.end();
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  Source-row normalisation                                           */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Drizzle returns rows as camelCase TypeScript objects (e.g. `userId`, not
+ * `user_id`). The PostgresMigrationTarget upserts via raw SQL and uses the
+ * column names as given — the `insights` no-vector path uses snake_case column
+ * aliases in the SELECT, so those rows already arrive as snake_case.
+ *
+ * For vector tables (insights), if `embedding` is absent from the source row
+ * (because DrizzleMigrationSource omitted it in the no-vector projection), we
+ * explicitly set it to null so the target ON CONFLICT UPDATE doesn't error.
+ *
+ * NOTE: insights.embedding is defined as `vector('embedding', { dimensions:
+ * 1536 })` with no `.notNull()` in schema.ts — it accepts NULL.
+ */
+export function normaliseSourceRow(
+  tableName: string,
+  row: Record<string, unknown>,
+  sourceHasVector: boolean,
+): Record<string, unknown> {
+  const out = { ...row };
+
+  if (VECTOR_TABLES.has(tableName) && !sourceHasVector) {
+    // Source cannot have embeddings — explicitly null them so ON CONFLICT
+    // UPDATE doesn't try to write undefined.
+    out['embedding'] = null;
+  }
+
+  return out;
+}
+
+/* ------------------------------------------------------------------ */
+/*  Precondition checks                                                 */
+/* ------------------------------------------------------------------ */
+
+export class MigrationPreconditionError extends Error {
+  constructor(
+    message: string,
+    public readonly remediation: string,
+  ) {
+    super(message);
+    this.name = 'MigrationPreconditionError';
+  }
+}
+
+/**
+ * Verify target preconditions before writing any data.
+ *
+ * Checks:
+ * 1. pgvector extension installed.
+ * 2. User-data tables are empty (unless --allow-non-empty).
+ */
+export async function checkTargetPreconditions(
+  target: MigrationTarget,
+  allowNonEmpty: boolean,
+  tablesToMigrate: string[],
+): Promise<void> {
+  const hasVector = await target.hasPgvector();
+  if (!hasVector) {
+    throw new MigrationPreconditionError(
+      'Target Postgres does not have the pgvector extension installed.',
+      'Run: CREATE EXTENSION IF NOT EXISTS vector; — or use the pgvector/pgvector:pg17 Docker image.',
+    );
+  }
+
+  if (!allowNonEmpty) {
+    // Check the first non-empty user-data table.
+    for (const table of tablesToMigrate) {
+      const n = await target.count(table);
+      if (n > 0) {
+        throw new MigrationPreconditionError(
+          `Target table "${table}" already contains ${n.toString()} rows.`,
+          'Pass --allow-non-empty to overwrite existing data (upsert semantics), ' +
+            'or point to an empty target database.',
+        );
+      }
+    }
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  Core migration runner                                               */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Run the tier migration.
+ *
+ * @param source  Adapter for reading source rows.
+ * @param target  Adapter for writing rows to target.
+ * @param opts    Migration options.
+ * @param sourceHasVector  True if the source tier supports vector columns.
+ */
+export async function runMigrateTier(
+  source: MigrationSource,
+  target: MigrationTarget,
+  opts: MigrateTierOptions,
+  sourceHasVector = false,
+): Promise<MigrateTierResult> {
+  const { dryRun, allowNonEmpty, batchSize, onProgress } = opts;
+
+  const tablesToMigrate = getMigrationOrder();
+
+  // Preflight: gather row counts from source.
+  onProgress('[migrate-tier] Gathering source row counts...');
+  const sourceCounts = new Map<string, number>();
+  for (const table of tablesToMigrate) {
+    const n = await source.count(table);
+    sourceCounts.set(table, n);
+  }
+
+  // Log preflight summary.
+  onProgress('[migrate-tier] Tables to migrate:');
+  for (const table of tablesToMigrate) {
+    const n = sourceCounts.get(table) ?? 0;
+    onProgress(`  ${table}: ${n.toString()} rows`);
+  }
+  for (const skipped of SKIP_TABLES) {
+    onProgress(`  ${skipped}: SKIPPED (ephemeral/environment-specific)`);
+  }
+
+  // Vector column notice.
+  if (!sourceHasVector) {
+    onProgress(
+      '[migrate-tier] NOTE: Source tier has no pgvector support. ' +
+        'insights.embedding will be NULL on all migrated rows.',
+    );
+  }
+
+  if (dryRun) {
+    onProgress('[migrate-tier] DRY RUN — no writes will be made.');
+    const tables: TableMigrationResult[] = tablesToMigrate.map((t) => ({
+      table: t,
+      rowsMigrated: 0,
+      skipped: false,
+    }));
+    for (const skipped of SKIP_TABLES) {
+      tables.push({ table: skipped, rowsMigrated: 0, skipped: true, skipReason: 'ephemeral' });
+    }
+    return { tables, totalRows: 0, dryRun: true };
+  }
+
+  // Check preconditions before writing.
+  await checkTargetPreconditions(target, allowNonEmpty, tablesToMigrate);
+
+  const results: TableMigrationResult[] = [];
+  let totalRows = 0;
+
+  for (const table of tablesToMigrate) {
+    const sourceCount = sourceCounts.get(table) ?? 0;
+
+    if (sourceCount === 0) {
+      onProgress(`[migrate-tier] ${table}: 0 rows — skipping.`);
+      results.push({ table, rowsMigrated: 0, skipped: false });
+      continue;
+    }
+
+    onProgress(`[migrate-tier] ${table}: migrating ${sourceCount.toString()} rows...`);
+
+    let offset = 0;
+    let tableTotal = 0;
+    let lastSuccessfulId: string | undefined;
+
+    try {
+      while (offset < sourceCount) {
+        const rows = await source.readTable(table, { limit: batchSize, offset });
+        if (rows.length === 0) break;
+
+        const normalised = rows.map((row) => normaliseSourceRow(table, row, sourceHasVector));
+
+        await target.upsertBatch(table, normalised);
+
+        lastSuccessfulId = rows[rows.length - 1]?.['id'] as string | undefined;
+        tableTotal += rows.length;
+        offset += rows.length;
+
+        onProgress(
+          `[migrate-tier] ${table}: ${tableTotal.toString()}/${sourceCount.toString()} rows written`,
+        );
+      }
+    } catch (err) {
+      const errMsg = err instanceof Error ? err.message : String(err);
+      throw new Error(
+        `[migrate-tier] Failed on table "${table}" after ${tableTotal.toString()} rows ` +
+          `(last id: ${lastSuccessfulId ?? 'none'}). Error: ${errMsg}\n` +
+          `Remediation: Re-run with --allow-non-empty to resume (upsert is idempotent).`,
+      );
+    }
+
+    results.push({ table, rowsMigrated: tableTotal, skipped: false });
+    totalRows += tableTotal;
+    onProgress(`[migrate-tier] ${table}: done (${tableTotal.toString()} rows).`);
+  }
+
+  // Add skipped table records.
+  for (const skipped of SKIP_TABLES) {
+    results.push({
+      table: skipped,
+      rowsMigrated: 0,
+      skipped: true,
+      skipReason: 'ephemeral or environment-specific — re-issue on target',
+    });
+  }
+
+  onProgress(`[migrate-tier] Complete. ${totalRows.toString()} total rows migrated.`);
+  return { tables: results, totalRows, dryRun: false };
+}

packages/storage/src/tier-detection.spec.ts

@@ -0,0 +1,546 @@
+/**
+ * Unit tests for tier-detection.ts.
+ *
+ * All external I/O (postgres, ioredis) is mocked — no live services required.
+ *
+ * Note on hoisting: vi.mock() factories are hoisted above all imports by vitest.
+ * Variables referenced inside factory callbacks must be declared via vi.hoisted()
+ * so they are available at hoist time.
+ */
+
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+/* ------------------------------------------------------------------ */
+/*  Hoist shared mock state so factories can reference it              */
+/* ------------------------------------------------------------------ */
+
+const mocks = vi.hoisted(() => {
+  const mockSqlFn = vi.fn();
+  const mockEnd = vi.fn().mockResolvedValue(undefined);
+  const mockPostgresConstructor = vi.fn(() => {
+    const sql = mockSqlFn as ReturnType<typeof mockSqlFn>;
+    (sql as unknown as Record<string, unknown>)['end'] = mockEnd;
+    return sql;
+  });
+
+  const mockRedisConnect = vi.fn().mockResolvedValue(undefined);
+  const mockRedisPing = vi.fn().mockResolvedValue('PONG');
+  const mockRedisDisconnect = vi.fn();
+  const MockRedis = vi.fn().mockImplementation(() => ({
+    connect: mockRedisConnect,
+    ping: mockRedisPing,
+    disconnect: mockRedisDisconnect,
+  }));
+
+  return {
+    mockSqlFn,
+    mockEnd,
+    mockPostgresConstructor,
+    mockRedisConnect,
+    mockRedisPing,
+    mockRedisDisconnect,
+    MockRedis,
+  };
+});
+
+/* ------------------------------------------------------------------ */
+/*  Module mocks (registered at hoist time)                            */
+/* ------------------------------------------------------------------ */
+
+vi.mock('postgres', () => ({
+  default: mocks.mockPostgresConstructor,
+}));
+
+vi.mock('ioredis', () => ({
+  Redis: mocks.MockRedis,
+}));
+
+/* ------------------------------------------------------------------ */
+/*  Import SUT after mocks are registered                              */
+/* ------------------------------------------------------------------ */
+
+import { detectAndAssertTier, probeServiceHealth, TierDetectionError } from './tier-detection.js';
+import type { TierConfig } from './tier-detection.js';
+
+/* ------------------------------------------------------------------ */
+/*  Config fixtures                                                     */
+/* ------------------------------------------------------------------ */
+
+const LOCAL_CONFIG: TierConfig = {
+  tier: 'local',
+  storage: { type: 'pglite', dataDir: '.mosaic/pglite' },
+  queue: { type: 'local' },
+};
+
+const STANDALONE_CONFIG: TierConfig = {
+  tier: 'standalone',
+  storage: { type: 'postgres', url: 'postgresql://mosaic:mosaic@db-host:5432/mosaic' },
+  queue: { type: 'bullmq', url: 'redis://valkey-host:6380' },
+};
+
+const FEDERATED_CONFIG: TierConfig = {
+  tier: 'federated',
+  storage: {
+    type: 'postgres',
+    url: 'postgresql://mosaic:mosaic@db-host:5433/mosaic',
+    enableVector: true,
+  },
+  queue: { type: 'bullmq', url: 'redis://valkey-host:6380' },
+};
+
+/* ------------------------------------------------------------------ */
+/*  Tests                                                               */
+/* ------------------------------------------------------------------ */
+
+describe('detectAndAssertTier', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+
+    // Default: all probes succeed.
+    mocks.mockSqlFn.mockResolvedValue([]);
+    mocks.mockEnd.mockResolvedValue(undefined);
+    mocks.mockRedisConnect.mockResolvedValue(undefined);
+    mocks.mockRedisPing.mockResolvedValue('PONG');
+
+    // Re-wire constructor to return a fresh sql-like object each time.
+    mocks.mockPostgresConstructor.mockImplementation(() => {
+      const sql = mocks.mockSqlFn as ReturnType<typeof mocks.mockSqlFn>;
+      (sql as unknown as Record<string, unknown>)['end'] = mocks.mockEnd;
+      return sql;
+    });
+    mocks.MockRedis.mockImplementation(() => ({
+      connect: mocks.mockRedisConnect,
+      ping: mocks.mockRedisPing,
+      disconnect: mocks.mockRedisDisconnect,
+    }));
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  1. local — no-op                                                 */
+  /* ---------------------------------------------------------------- */
+
+  it('resolves immediately for tier=local without touching postgres or ioredis', async () => {
+    await expect(detectAndAssertTier(LOCAL_CONFIG)).resolves.toBeUndefined();
+    expect(mocks.mockPostgresConstructor).not.toHaveBeenCalled();
+    expect(mocks.MockRedis).not.toHaveBeenCalled();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  2. standalone — happy path                                       */
+  /* ---------------------------------------------------------------- */
+
+  it('resolves for tier=standalone when postgres and valkey are reachable', async () => {
+    await expect(detectAndAssertTier(STANDALONE_CONFIG)).resolves.toBeUndefined();
+
+    // Postgres was probed (SELECT 1 only — no pgvector check).
+    expect(mocks.mockPostgresConstructor).toHaveBeenCalledTimes(1);
+    expect(mocks.mockSqlFn).toHaveBeenCalledTimes(1);
+    // Valkey was probed.
+    expect(mocks.MockRedis).toHaveBeenCalledTimes(1);
+    expect(mocks.mockRedisPing).toHaveBeenCalledTimes(1);
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  3. standalone — postgres unreachable                             */
+  /* ---------------------------------------------------------------- */
+
+  it('throws TierDetectionError with service=postgres when postgres query rejects', async () => {
+    mocks.mockSqlFn.mockRejectedValueOnce(new Error('connection refused'));
+
+    const promise = detectAndAssertTier(STANDALONE_CONFIG);
+    await expect(promise).rejects.toBeInstanceOf(TierDetectionError);
+
+    // Confirm no valkey probe happened (fail fast on first error).
+    expect(mocks.MockRedis).not.toHaveBeenCalled();
+  });
+
+  it('sets service=postgres on the error when postgres fails', async () => {
+    mocks.mockSqlFn.mockRejectedValue(new Error('connection refused'));
+
+    try {
+      await detectAndAssertTier(STANDALONE_CONFIG);
+      expect.fail('should have thrown');
+    } catch (err) {
+      expect(err).toBeInstanceOf(TierDetectionError);
+      const typed = err as TierDetectionError;
+      expect(typed.service).toBe('postgres');
+      expect(typed.remediation).toContain('docker compose');
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  4. standalone — valkey unreachable                               */
+  /* ---------------------------------------------------------------- */
+
+  it('throws TierDetectionError with service=valkey when ping fails', async () => {
+    // Postgres probe succeeds; valkey connect fails.
+    mocks.mockSqlFn.mockResolvedValue([]);
+    mocks.mockRedisConnect.mockRejectedValue(new Error('ECONNREFUSED'));
+
+    try {
+      await detectAndAssertTier(STANDALONE_CONFIG);
+      expect.fail('should have thrown');
+    } catch (err) {
+      expect(err).toBeInstanceOf(TierDetectionError);
+      const typed = err as TierDetectionError;
+      expect(typed.service).toBe('valkey');
+      expect(typed.message).toContain('valkey');
+      expect(typed.remediation).toContain('valkey-federated');
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  5. federated — happy path                                        */
+  /* ---------------------------------------------------------------- */
+
+  it('resolves for tier=federated when all three checks pass', async () => {
+    // SELECT 1 and CREATE EXTENSION both succeed.
+    mocks.mockSqlFn.mockResolvedValue([]);
+
+    await expect(detectAndAssertTier(FEDERATED_CONFIG)).resolves.toBeUndefined();
+
+    // postgres probe (SELECT 1) + pgvector probe (CREATE EXTENSION) = 2 postgres constructors.
+    expect(mocks.mockPostgresConstructor).toHaveBeenCalledTimes(2);
+    expect(mocks.mockSqlFn).toHaveBeenCalledTimes(2);
+    // Valkey probed once.
+    expect(mocks.MockRedis).toHaveBeenCalledTimes(1);
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  6. federated — pgvector not installable                          */
+  /* ---------------------------------------------------------------- */
+
+  it('throws TierDetectionError with service=pgvector when CREATE EXTENSION fails', async () => {
+    // SELECT 1 succeeds (first call), CREATE EXTENSION fails (second call).
+    mocks.mockSqlFn
+      .mockResolvedValueOnce([]) // SELECT 1
+      .mockRejectedValueOnce(new Error('extension "vector" is not available'));
+
+    try {
+      await detectAndAssertTier(FEDERATED_CONFIG);
+      expect.fail('should have thrown');
+    } catch (err) {
+      expect(err).toBeInstanceOf(TierDetectionError);
+      const typed = err as TierDetectionError;
+      expect(typed.service).toBe('pgvector');
+      expect(typed.message).toContain('pgvector');
+      expect(typed.remediation).toContain('pgvector/pgvector');
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  7. probeValkey honors connectTimeout and lazyConnect            */
+  /* ---------------------------------------------------------------- */
+
+  it('constructs the ioredis Redis client with connectTimeout: 5000', async () => {
+    await detectAndAssertTier(STANDALONE_CONFIG);
+
+    expect(mocks.MockRedis).toHaveBeenCalledOnce();
+    expect(mocks.MockRedis).toHaveBeenCalledWith(
+      expect.any(String),
+      expect.objectContaining({ connectTimeout: 5000, lazyConnect: true }),
+    );
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  8. probePgvector — library-not-installed remediation             */
+  /* ---------------------------------------------------------------- */
+
+  it('includes pgvector/pgvector:pg17 in remediation when pgvector library is missing', async () => {
+    // SELECT 1 succeeds; CREATE EXTENSION fails with the canonical library-missing message.
+    mocks.mockSqlFn
+      .mockResolvedValueOnce([]) // SELECT 1 (probePostgres)
+      .mockRejectedValueOnce(new Error('extension "vector" is not available')); // probePgvector
+
+    try {
+      await detectAndAssertTier(FEDERATED_CONFIG);
+      expect.fail('should have thrown');
+    } catch (err) {
+      expect(err).toBeInstanceOf(TierDetectionError);
+      const typed = err as TierDetectionError;
+      expect(typed.service).toBe('pgvector');
+      expect(typed.remediation).toContain('pgvector/pgvector:pg17');
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  9. probePgvector — permission / other error remediation          */
+  /* ---------------------------------------------------------------- */
+
+  it('mentions CREATE permission or superuser in remediation for a generic pgvector error', async () => {
+    // SELECT 1 succeeds; CREATE EXTENSION fails with a permission error.
+    mocks.mockSqlFn
+      .mockResolvedValueOnce([]) // SELECT 1 (probePostgres)
+      .mockRejectedValueOnce(new Error('permission denied to create extension'));
+
+    try {
+      await detectAndAssertTier(FEDERATED_CONFIG);
+      expect.fail('should have thrown');
+    } catch (err) {
+      expect(err).toBeInstanceOf(TierDetectionError);
+      const typed = err as TierDetectionError;
+      expect(typed.service).toBe('pgvector');
+      // Must NOT point to the image fix — that's only for the library-missing case.
+      expect(typed.remediation).not.toContain('pgvector/pgvector:pg17');
+      // Must mention permissions or superuser.
+      expect(typed.remediation).toMatch(/CREATE|superuser/i);
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  10. federated tier rejects non-bullmq queue.type                 */
+  /* ---------------------------------------------------------------- */
+
+  it('throws TierDetectionError with service=config for federated tier with queue.type !== bullmq', async () => {
+    const badConfig: TierConfig = {
+      tier: 'federated',
+      storage: {
+        type: 'postgres',
+        url: 'postgresql://mosaic:mosaic@db-host:5433/mosaic',
+        enableVector: true,
+      },
+      queue: { type: 'local' },
+    };
+
+    try {
+      await detectAndAssertTier(badConfig);
+      expect.fail('should have thrown');
+    } catch (err) {
+      expect(err).toBeInstanceOf(TierDetectionError);
+      const typed = err as TierDetectionError;
+      expect(typed.service).toBe('config');
+      expect(typed.remediation).toContain('bullmq');
+    }
+
+    // No network probes should have been attempted.
+    expect(mocks.mockPostgresConstructor).not.toHaveBeenCalled();
+    expect(mocks.MockRedis).not.toHaveBeenCalled();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  11. Error fields populated                                        */
+  /* ---------------------------------------------------------------- */
+
+  it('populates host, port, and remediation on a thrown TierDetectionError', async () => {
+    mocks.mockSqlFn.mockRejectedValue(new Error('connection refused'));
+
+    let caught: TierDetectionError | undefined;
+    try {
+      await detectAndAssertTier(STANDALONE_CONFIG);
+    } catch (err) {
+      caught = err as TierDetectionError;
+    }
+
+    expect(caught).toBeInstanceOf(TierDetectionError);
+    expect(caught!.service).toBe('postgres');
+    // Host and port are extracted from the Postgres URL in STANDALONE_CONFIG.
+    expect(caught!.host).toBe('db-host');
+    expect(caught!.port).toBe(5432);
+    expect(caught!.remediation).toMatch(/docker compose/i);
+    expect(caught!.message).toContain('db-host:5432');
+  });
+});
+
+/* ------------------------------------------------------------------ */
+/*  probeServiceHealth tests                                           */
+/* ------------------------------------------------------------------ */
+
+describe('probeServiceHealth', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+
+    mocks.mockSqlFn.mockResolvedValue([]);
+    mocks.mockEnd.mockResolvedValue(undefined);
+    mocks.mockRedisConnect.mockResolvedValue(undefined);
+    mocks.mockRedisPing.mockResolvedValue('PONG');
+
+    mocks.mockPostgresConstructor.mockImplementation(() => {
+      const sql = mocks.mockSqlFn as ReturnType<typeof mocks.mockSqlFn>;
+      (sql as unknown as Record<string, unknown>)['end'] = mocks.mockEnd;
+      return sql;
+    });
+    mocks.MockRedis.mockImplementation(() => ({
+      connect: mocks.mockRedisConnect,
+      ping: mocks.mockRedisPing,
+      disconnect: mocks.mockRedisDisconnect,
+    }));
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  12. local tier — all skipped, green                              */
+  /* ---------------------------------------------------------------- */
+
+  it('returns all services as skipped and overall green for local tier', async () => {
+    const report = await probeServiceHealth(LOCAL_CONFIG);
+
+    expect(report.tier).toBe('local');
+    expect(report.overall).toBe('green');
+    expect(report.services).toHaveLength(3);
+    for (const svc of report.services) {
+      expect(svc.status).toBe('skipped');
+    }
+    expect(mocks.mockPostgresConstructor).not.toHaveBeenCalled();
+    expect(mocks.MockRedis).not.toHaveBeenCalled();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  13. postgres fails, valkey ok → red                              */
+  /* ---------------------------------------------------------------- */
+
+  it('returns red overall with postgres fail and valkey ok for standalone when postgres fails', async () => {
+    mocks.mockSqlFn.mockRejectedValue(new Error('connection refused'));
+
+    const report = await probeServiceHealth(STANDALONE_CONFIG);
+
+    expect(report.overall).toBe('red');
+
+    const pgCheck = report.services.find((s) => s.name === 'postgres');
+    expect(pgCheck?.status).toBe('fail');
+    expect(pgCheck?.error).toBeDefined();
+    expect(pgCheck?.error?.remediation).toContain('docker compose');
+
+    const vkCheck = report.services.find((s) => s.name === 'valkey');
+    expect(vkCheck?.status).toBe('ok');
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  14. federated all green → 3 services ok                         */
+  /* ---------------------------------------------------------------- */
+
+  it('returns green overall with all 3 services ok for federated when all pass', async () => {
+    mocks.mockSqlFn.mockResolvedValue([]);
+
+    const report = await probeServiceHealth(FEDERATED_CONFIG);
+
+    expect(report.tier).toBe('federated');
+    expect(report.overall).toBe('green');
+    expect(report.services).toHaveLength(3);
+
+    for (const svc of report.services) {
+      expect(svc.status).toBe('ok');
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  15. durationMs is a non-negative number for every service check  */
+  /* ---------------------------------------------------------------- */
+
+  it('sets durationMs as a non-negative number for every service check', async () => {
+    mocks.mockSqlFn.mockResolvedValue([]);
+
+    const report = await probeServiceHealth(FEDERATED_CONFIG);
+
+    for (const svc of report.services) {
+      expect(typeof svc.durationMs).toBe('number');
+      expect(svc.durationMs).toBeGreaterThanOrEqual(0);
+    }
+  });
+
+  it('sets durationMs >= 0 even for skipped services (local tier)', async () => {
+    const report = await probeServiceHealth(LOCAL_CONFIG);
+
+    for (const svc of report.services) {
+      expect(typeof svc.durationMs).toBe('number');
+      expect(svc.durationMs).toBeGreaterThanOrEqual(0);
+    }
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  16. configPath is passed through to the report                   */
+  /* ---------------------------------------------------------------- */
+
+  it('includes configPath in the report when provided', async () => {
+    const report = await probeServiceHealth(LOCAL_CONFIG, '/etc/mosaic/mosaic.config.json');
+    expect(report.configPath).toBe('/etc/mosaic/mosaic.config.json');
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  17. standalone — valkey fails, postgres ok → red                 */
+  /* ---------------------------------------------------------------- */
+
+  it('returns red with valkey fail and postgres ok for standalone when valkey fails', async () => {
+    mocks.mockSqlFn.mockResolvedValue([]);
+    mocks.mockRedisConnect.mockRejectedValue(new Error('ECONNREFUSED'));
+
+    const report = await probeServiceHealth(STANDALONE_CONFIG);
+
+    expect(report.overall).toBe('red');
+
+    const pgCheck = report.services.find((s) => s.name === 'postgres');
+    expect(pgCheck?.status).toBe('ok');
+
+    const vkCheck = report.services.find((s) => s.name === 'valkey');
+    expect(vkCheck?.status).toBe('fail');
+    expect(vkCheck?.error).toBeDefined();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  18. federated — pgvector fails → red with remediation           */
+  /* ---------------------------------------------------------------- */
+
+  it('returns red with pgvector fail for federated when pgvector probe fails', async () => {
+    mocks.mockSqlFn
+      .mockResolvedValueOnce([]) // postgres SELECT 1
+      .mockRejectedValueOnce(new Error('extension "vector" is not available')); // pgvector
+
+    const report = await probeServiceHealth(FEDERATED_CONFIG);
+
+    expect(report.overall).toBe('red');
+
+    const pvCheck = report.services.find((s) => s.name === 'pgvector');
+    expect(pvCheck?.status).toBe('fail');
+    expect(pvCheck?.error?.remediation).toContain('pgvector/pgvector:pg17');
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  19. federated — non-bullmq queue → red config error, no network */
+  /* ---------------------------------------------------------------- */
+
+  it('returns red overall with config error when federated tier has non-bullmq queue (no network call)', async () => {
+    const federatedBadQueueConfig: TierConfig = {
+      tier: 'federated',
+      storage: {
+        type: 'postgres',
+        url: 'postgresql://mosaic:mosaic@db-host:5433/mosaic',
+        enableVector: true,
+      },
+      queue: { type: 'local' },
+    };
+
+    const report = await probeServiceHealth(federatedBadQueueConfig);
+
+    expect(report.overall).toBe('red');
+
+    const valkey = report.services.find((s) => s.name === 'valkey');
+    expect(valkey?.status).toBe('fail');
+    expect(valkey?.error?.remediation).toMatch(/bullmq/i);
+
+    // Critically: no network call was made — MockRedis constructor must NOT have been called.
+    expect(mocks.MockRedis).not.toHaveBeenCalled();
+  });
+
+  /* ---------------------------------------------------------------- */
+  /*  20. durationMs actually measures real elapsed time               */
+  /* ---------------------------------------------------------------- */
+
+  it('measures real elapsed time for service probes', async () => {
+    const DELAY_MS = 25;
+
+    // Make the postgres mock introduce a real wall-clock delay.
+    mocks.mockSqlFn.mockImplementation(
+      () =>
+        new Promise((resolve) =>
+          setTimeout(() => {
+            resolve([]);
+          }, DELAY_MS),
+        ),
+    );
+
+    const report = await probeServiceHealth(STANDALONE_CONFIG);
+
+    const pgCheck = report.services.find((s) => s.name === 'postgres');
+    expect(pgCheck).toBeDefined();
+    // Must be >= 20ms (small slack for jitter). Would be 0 if timer were stubbed.
+    expect(pgCheck!.durationMs).toBeGreaterThanOrEqual(20);
+  });
+});

packages/storage/src/tier-detection.ts

@@ -0,0 +1,555 @@
+/**
+ * Tier Detection — pre-flight service reachability probes.
+ *
+ * Lifted from apps/gateway/src/bootstrap/tier-detector.ts so both the gateway
+ * and the mosaic CLI can share the same probe logic without duplicating code or
+ * creating circular workspace dependencies.
+ *
+ * Library choices:
+ * - Postgres: `postgres` npm package (already a dep via @mosaicstack/db / drizzle-orm).
+ * - Valkey: `ioredis` (compatible with Valkey; same URL convention used by bullmq).
+ */
+
+import postgres from 'postgres';
+import { Redis } from 'ioredis';
+
+/* ------------------------------------------------------------------ */
+/*  Local structural type — avoids circular dependency                  */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Minimal structural shape required for tier detection.
+ * Mirrors the relevant fields of MosaicConfig (from @mosaicstack/config) without
+ * creating a dependency cycle (config depends on storage for StorageConfig).
+ * Any object that satisfies MosaicConfig also satisfies this type.
+ */
+export interface TierConfig {
+  tier: 'local' | 'standalone' | 'federated';
+  storage:
+    | { type: 'pglite'; dataDir?: string }
+    | { type: 'postgres'; url: string; enableVector?: boolean }
+    | { type: 'files'; dataDir: string; format?: 'json' | 'md' };
+  queue: { type: string; url?: string };
+}
+
+/* ------------------------------------------------------------------ */
+/*  Public types                                                        */
+/* ------------------------------------------------------------------ */
+
+export interface ServiceCheck {
+  name: 'postgres' | 'valkey' | 'pgvector';
+  status: 'ok' | 'fail' | 'skipped';
+  host?: string;
+  port?: number;
+  durationMs: number;
+  error?: { message: string; remediation: string };
+}
+
+export interface TierHealthReport {
+  tier: 'local' | 'standalone' | 'federated';
+  configPath?: string;
+  overall: 'green' | 'yellow' | 'red';
+  services: ServiceCheck[];
+}
+
+/* ------------------------------------------------------------------ */
+/*  Structured error type                                               */
+/* ------------------------------------------------------------------ */
+
+export class TierDetectionError extends Error {
+  public readonly service: 'postgres' | 'valkey' | 'pgvector' | 'config';
+  public readonly host: string;
+  public readonly port: number;
+  public readonly remediation: string;
+
+  constructor(opts: {
+    service: 'postgres' | 'valkey' | 'pgvector' | 'config';
+    host: string;
+    port: number;
+    remediation: string;
+    cause?: unknown;
+  }) {
+    const message =
+      `[tier-detector] ${opts.service} unreachable or unusable at ` +
+      `${opts.host}:${opts.port} — ${opts.remediation}`;
+    super(message, { cause: opts.cause });
+    this.name = 'TierDetectionError';
+    this.service = opts.service;
+    this.host = opts.host;
+    this.port = opts.port;
+    this.remediation = opts.remediation;
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  URL helpers                                                        */
+/* ------------------------------------------------------------------ */
+
+/** Extract host and port from a URL string, returning safe fallbacks on parse failure. */
+function parseHostPort(url: string, defaultPort: number): { host: string; port: number } {
+  try {
+    const parsed = new URL(url);
+    const host = parsed.hostname || 'unknown';
+    const port = parsed.port ? parseInt(parsed.port, 10) : defaultPort;
+    return { host, port };
+  } catch {
+    return { host: 'unknown', port: defaultPort };
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  Internal probe results                                             */
+/* ------------------------------------------------------------------ */
+
+interface ProbeResult {
+  host: string;
+  port: number;
+  durationMs: number;
+  error?: { message: string; remediation: string };
+}
+
+/* ------------------------------------------------------------------ */
+/*  Postgres probe                                                      */
+/* ------------------------------------------------------------------ */
+
+async function probePostgres(url: string): Promise<void> {
+  const { host, port } = parseHostPort(url, 5432);
+  let sql: ReturnType<typeof postgres> | undefined;
+  try {
+    sql = postgres(url, {
+      max: 1,
+      connect_timeout: 5,
+      idle_timeout: 5,
+    });
+    // Run a trivial query to confirm connectivity.
+    await sql`SELECT 1`;
+  } catch (cause) {
+    throw new TierDetectionError({
+      service: 'postgres',
+      host,
+      port,
+      remediation:
+        'Start Postgres: `docker compose -f docker-compose.federated.yml --profile federated up -d postgres-federated`',
+      cause,
+    });
+  } finally {
+    if (sql) {
+      await sql.end({ timeout: 2 }).catch(() => {
+        // Ignore cleanup errors — we already have what we need.
+      });
+    }
+  }
+}
+
+async function probePostgresMeasured(url: string): Promise<ProbeResult> {
+  const { host, port } = parseHostPort(url, 5432);
+  const start = Date.now();
+  let sql: ReturnType<typeof postgres> | undefined;
+  try {
+    sql = postgres(url, {
+      max: 1,
+      connect_timeout: 5,
+      idle_timeout: 5,
+    });
+    await sql`SELECT 1`;
+    return { host, port, durationMs: Date.now() - start };
+  } catch (cause) {
+    return {
+      host,
+      port,
+      durationMs: Date.now() - start,
+      error: {
+        message: cause instanceof Error ? cause.message : String(cause),
+        remediation:
+          'Start Postgres: `docker compose -f docker-compose.federated.yml --profile federated up -d postgres-federated`',
+      },
+    };
+  } finally {
+    if (sql) {
+      await sql.end({ timeout: 2 }).catch(() => {});
+    }
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  pgvector probe                                                      */
+/* ------------------------------------------------------------------ */
+
+async function probePgvector(url: string): Promise<void> {
+  const { host, port } = parseHostPort(url, 5432);
+  let sql: ReturnType<typeof postgres> | undefined;
+  try {
+    sql = postgres(url, {
+      max: 1,
+      connect_timeout: 5,
+      idle_timeout: 5,
+    });
+    // This succeeds whether the extension is already installed or freshly created.
+    // It errors only if the pgvector shared library is missing from the Postgres binary.
+    await sql`CREATE EXTENSION IF NOT EXISTS vector`;
+  } catch (cause) {
+    const causeMsg = cause instanceof Error ? cause.message.toLowerCase() : '';
+    const isLibraryMissing = causeMsg.includes('extension "vector" is not available');
+    const remediation = isLibraryMissing
+      ? 'Use the `pgvector/pgvector:pg17` image, not the stock `postgres:17` image. See `docker-compose.federated.yml`.'
+      : 'The database role lacks permission to CREATE EXTENSION. Grant `CREATE` on the database, or run as a superuser.';
+    throw new TierDetectionError({
+      service: 'pgvector',
+      host,
+      port,
+      remediation,
+      cause,
+    });
+  } finally {
+    if (sql) {
+      await sql.end({ timeout: 2 }).catch(() => {
+        // Ignore cleanup errors.
+      });
+    }
+  }
+}
+
+async function probePgvectorMeasured(url: string): Promise<ProbeResult> {
+  const { host, port } = parseHostPort(url, 5432);
+  const start = Date.now();
+  let sql: ReturnType<typeof postgres> | undefined;
+  try {
+    sql = postgres(url, {
+      max: 1,
+      connect_timeout: 5,
+      idle_timeout: 5,
+    });
+    await sql`CREATE EXTENSION IF NOT EXISTS vector`;
+    return { host, port, durationMs: Date.now() - start };
+  } catch (cause) {
+    const causeMsg = cause instanceof Error ? cause.message.toLowerCase() : '';
+    const isLibraryMissing = causeMsg.includes('extension "vector" is not available');
+    const remediation = isLibraryMissing
+      ? 'Use the `pgvector/pgvector:pg17` image, not the stock `postgres:17` image. See `docker-compose.federated.yml`.'
+      : 'The database role lacks permission to CREATE EXTENSION. Grant `CREATE` on the database, or run as a superuser.';
+    return {
+      host,
+      port,
+      durationMs: Date.now() - start,
+      error: { message: cause instanceof Error ? cause.message : String(cause), remediation },
+    };
+  } finally {
+    if (sql) {
+      await sql.end({ timeout: 2 }).catch(() => {});
+    }
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  Valkey probe                                                        */
+/* ------------------------------------------------------------------ */
+
+const DEFAULT_VALKEY_URL = 'redis://localhost:6380';
+
+async function probeValkey(url: string): Promise<void> {
+  const { host, port } = parseHostPort(url, 6380);
+  const client = new Redis(url, {
+    enableReadyCheck: false,
+    maxRetriesPerRequest: 0,
+    retryStrategy: () => null, // no retries — fail fast
+    lazyConnect: true,
+    connectTimeout: 5000, // fail-fast: 5-second hard cap on connection attempt
+  });
+
+  try {
+    await client.connect();
+    const pong = await client.ping();
+    if (pong !== 'PONG') {
+      throw new Error(`Unexpected PING response: ${pong}`);
+    }
+  } catch (cause) {
+    throw new TierDetectionError({
+      service: 'valkey',
+      host,
+      port,
+      remediation:
+        'Start Valkey: `docker compose -f docker-compose.federated.yml --profile federated up -d valkey-federated`',
+      cause,
+    });
+  } finally {
+    client.disconnect();
+  }
+}
+
+async function probeValkeyMeasured(url: string): Promise<ProbeResult> {
+  const { host, port } = parseHostPort(url, 6380);
+  const start = Date.now();
+  const client = new Redis(url, {
+    enableReadyCheck: false,
+    maxRetriesPerRequest: 0,
+    retryStrategy: () => null,
+    lazyConnect: true,
+    connectTimeout: 5000,
+  });
+  try {
+    await client.connect();
+    const pong = await client.ping();
+    if (pong !== 'PONG') {
+      throw new Error(`Unexpected PING response: ${pong}`);
+    }
+    return { host, port, durationMs: Date.now() - start };
+  } catch (cause) {
+    return {
+      host,
+      port,
+      durationMs: Date.now() - start,
+      error: {
+        message: cause instanceof Error ? cause.message : String(cause),
+        remediation:
+          'Start Valkey: `docker compose -f docker-compose.federated.yml --profile federated up -d valkey-federated`',
+      },
+    };
+  } finally {
+    client.disconnect();
+  }
+}
+
+/* ------------------------------------------------------------------ */
+/*  Public entry points                                                 */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Assert that all services required by `config.tier` are reachable.
+ *
+ * - `local`      — no-op (PGlite is in-process; no external services).
+ * - `standalone` — assert Postgres + Valkey (if queue.type === 'bullmq').
+ * - `federated`  — assert Postgres + Valkey + pgvector installability.
+ *
+ * Throws `TierDetectionError` on the first failure with host:port and
+ * a remediation hint.
+ */
+export async function detectAndAssertTier(config: TierConfig): Promise<void> {
+  if (config.tier === 'local') {
+    // PGlite runs in-process — nothing to probe.
+    return;
+  }
+
+  const pgUrl =
+    config.storage.type === 'postgres' ? config.storage.url : 'postgresql://localhost:5432/mosaic';
+
+  const valkeyUrl =
+    config.queue.type === 'bullmq' ? (config.queue.url ?? DEFAULT_VALKEY_URL) : null;
+
+  if (config.tier === 'standalone') {
+    await probePostgres(pgUrl);
+    if (valkeyUrl) {
+      await probeValkey(valkeyUrl);
+    }
+    return;
+  }
+
+  // tier === 'federated'
+  // Reject misconfigured queue upfront — federated requires bullmq + a Valkey URL.
+  if (config.queue.type !== 'bullmq') {
+    throw new TierDetectionError({
+      service: 'config',
+      host: 'localhost',
+      port: 0,
+      remediation:
+        "Federated tier requires queue.type === 'bullmq'. " +
+        "Set queue: { type: 'bullmq', url: 'redis://...' } in your mosaic.config.json.",
+    });
+  }
+  const federatedValkeyUrl = config.queue.url ?? DEFAULT_VALKEY_URL;
+  await probePostgres(pgUrl);
+  await probeValkey(federatedValkeyUrl);
+  await probePgvector(pgUrl);
+}
+
+/**
+ * Non-throwing variant for `mosaic gateway doctor`.
+ *
+ * Probes ALL required services even if some fail, returning a structured report.
+ * Services not required for the current tier are reported as `skipped`.
+ *
+ * Overall status:
+ * - `green`  — all required services OK
+ * - `yellow` — all required services OK, but a non-critical check failed
+ *              (currently unused — reserved for future optional probes)
+ * - `red`    — at least one required service failed
+ */
+export async function probeServiceHealth(
+  config: TierConfig,
+  configPath?: string,
+): Promise<TierHealthReport> {
+  const tier = config.tier;
+
+  // local tier: PGlite is in-process, no external services needed.
+  if (tier === 'local') {
+    return {
+      tier,
+      configPath,
+      overall: 'green',
+      services: [
+        { name: 'postgres', status: 'skipped', durationMs: 0 },
+        { name: 'valkey', status: 'skipped', durationMs: 0 },
+        { name: 'pgvector', status: 'skipped', durationMs: 0 },
+      ],
+    };
+  }
+
+  const pgUrl =
+    config.storage.type === 'postgres' ? config.storage.url : 'postgresql://localhost:5432/mosaic';
+
+  const valkeyUrl =
+    config.queue.type === 'bullmq' ? (config.queue.url ?? DEFAULT_VALKEY_URL) : null;
+
+  const services: ServiceCheck[] = [];
+  let hasFailure = false;
+
+  if (tier === 'standalone') {
+    // Postgres — required
+    const pgResult = await probePostgresMeasured(pgUrl);
+    if (pgResult.error) {
+      hasFailure = true;
+      services.push({
+        name: 'postgres',
+        status: 'fail',
+        host: pgResult.host,
+        port: pgResult.port,
+        durationMs: pgResult.durationMs,
+        error: pgResult.error,
+      });
+    } else {
+      services.push({
+        name: 'postgres',
+        status: 'ok',
+        host: pgResult.host,
+        port: pgResult.port,
+        durationMs: pgResult.durationMs,
+      });
+    }
+
+    // Valkey — required if bullmq
+    if (valkeyUrl) {
+      const vkResult = await probeValkeyMeasured(valkeyUrl);
+      if (vkResult.error) {
+        hasFailure = true;
+        services.push({
+          name: 'valkey',
+          status: 'fail',
+          host: vkResult.host,
+          port: vkResult.port,
+          durationMs: vkResult.durationMs,
+          error: vkResult.error,
+        });
+      } else {
+        services.push({
+          name: 'valkey',
+          status: 'ok',
+          host: vkResult.host,
+          port: vkResult.port,
+          durationMs: vkResult.durationMs,
+        });
+      }
+    } else {
+      services.push({ name: 'valkey', status: 'skipped', durationMs: 0 });
+    }
+
+    // pgvector — not required for standalone
+    services.push({ name: 'pgvector', status: 'skipped', durationMs: 0 });
+
+    return {
+      tier,
+      configPath,
+      overall: hasFailure ? 'red' : 'green',
+      services,
+    };
+  }
+
+  // tier === 'federated'
+  // Postgres — required
+  const pgResult = await probePostgresMeasured(pgUrl);
+  if (pgResult.error) {
+    hasFailure = true;
+    services.push({
+      name: 'postgres',
+      status: 'fail',
+      host: pgResult.host,
+      port: pgResult.port,
+      durationMs: pgResult.durationMs,
+      error: pgResult.error,
+    });
+  } else {
+    services.push({
+      name: 'postgres',
+      status: 'ok',
+      host: pgResult.host,
+      port: pgResult.port,
+      durationMs: pgResult.durationMs,
+    });
+  }
+
+  // Valkey — required for federated (queue.type must be bullmq)
+  if (config.queue.type !== 'bullmq') {
+    hasFailure = true;
+    services.push({
+      name: 'valkey',
+      status: 'fail',
+      host: 'localhost',
+      port: 0,
+      durationMs: 0,
+      error: {
+        message: "Federated tier requires queue.type === 'bullmq'",
+        remediation:
+          "Set queue: { type: 'bullmq', url: 'redis://...' } in your mosaic.config.json.",
+      },
+    });
+  } else {
+    const federatedValkeyUrl = config.queue.url ?? DEFAULT_VALKEY_URL;
+    const vkResult = await probeValkeyMeasured(federatedValkeyUrl);
+    if (vkResult.error) {
+      hasFailure = true;
+      services.push({
+        name: 'valkey',
+        status: 'fail',
+        host: vkResult.host,
+        port: vkResult.port,
+        durationMs: vkResult.durationMs,
+        error: vkResult.error,
+      });
+    } else {
+      services.push({
+        name: 'valkey',
+        status: 'ok',
+        host: vkResult.host,
+        port: vkResult.port,
+        durationMs: vkResult.durationMs,
+      });
+    }
+  }
+
+  // pgvector — required for federated
+  const pvResult = await probePgvectorMeasured(pgUrl);
+  if (pvResult.error) {
+    hasFailure = true;
+    services.push({
+      name: 'pgvector',
+      status: 'fail',
+      host: pvResult.host,
+      port: pvResult.port,
+      durationMs: pvResult.durationMs,
+      error: pvResult.error,
+    });
+  } else {
+    services.push({
+      name: 'pgvector',
+      status: 'ok',
+      host: pvResult.host,
+      port: pvResult.port,
+      durationMs: pvResult.durationMs,
+    });
+  }
+
+  return {
+    tier,
+    configPath,
+    overall: hasFailure ? 'red' : 'green',
+    services,
+  };
+}

packages/storage/src/types.ts

@@ -38,6 +38,6 @@ export interface StorageAdapter {
 }
 
 export type StorageConfig =
-  | { type: 'postgres'; url: string }
+  | { type: 'postgres'; url: string; enableVector?: boolean }
   | { type: 'pglite'; dataDir?: string }
   | { type: 'files'; dataDir: string; format?: 'json' | 'md' };

packages/storage/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+  },
+});

pnpm-lock.yaml

@@ -152,12 +152,18 @@ importers:
       fastify:
         specifier: ^5.0.0
         version: 5.8.2
+      ioredis:
+        specifier: ^5.10.0
+        version: 5.10.0
       node-cron:
         specifier: ^4.2.1
         version: 4.2.1
       openai:
         specifier: ^6.32.0
         version: 6.32.0(ws@8.20.0)(zod@4.3.6)
+      postgres:
+        specifier: ^3.4.8
+        version: 3.4.8
       reflect-metadata:
         specifier: ^0.2.0
         version: 0.2.2
@@ -642,6 +648,12 @@ importers:
       commander:
         specifier: ^13.0.0
         version: 13.1.0
+      ioredis:
+        specifier: ^5.10.0
+        version: 5.10.0
+      postgres:
+        specifier: ^3.4.8
+        version: 3.4.8
     devDependencies:
       typescript:
         specifier: ^5.8.0