feat(api): add findings module with vector search (MS22-DB-001, MS22-API-001) (#585)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/api/prisma/migrations/20260301194500_add_findings/migration.sql

@@ -0,0 +1,37 @@
+-- CreateTable
+CREATE TABLE "findings" (
+    "id" UUID NOT NULL,
+    "workspace_id" UUID NOT NULL,
+    "task_id" UUID,
+    "agent_id" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "title" TEXT NOT NULL,
+    "data" JSONB NOT NULL,
+    "summary" TEXT NOT NULL,
+    "embedding" vector(1536),
+    "created_at" TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMPTZ NOT NULL,
+
+    CONSTRAINT "findings_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "findings_id_workspace_id_key" ON "findings"("id", "workspace_id");
+
+-- CreateIndex
+CREATE INDEX "findings_workspace_id_idx" ON "findings"("workspace_id");
+
+-- CreateIndex
+CREATE INDEX "findings_agent_id_idx" ON "findings"("agent_id");
+
+-- CreateIndex
+CREATE INDEX "findings_type_idx" ON "findings"("type");
+
+-- CreateIndex
+CREATE INDEX "findings_task_id_idx" ON "findings"("task_id");
+
+-- AddForeignKey
+ALTER TABLE "findings" ADD CONSTRAINT "findings_workspace_id_fkey" FOREIGN KEY ("workspace_id") REFERENCES "workspaces"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "findings" ADD CONSTRAINT "findings_task_id_fkey" FOREIGN KEY ("task_id") REFERENCES "agent_tasks"("id") ON DELETE SET NULL ON UPDATE CASCADE;

apps/api/prisma/schema.prisma

@@ -298,6 +298,7 @@ model Workspace {
   agents                       Agent[]
   agentSessions                AgentSession[]
   agentTasks                   AgentTask[]
+  findings                     Finding[]
   userLayouts                  UserLayout[]
   knowledgeEntries             KnowledgeEntry[]
   knowledgeTags                KnowledgeTag[]
@@ -689,6 +690,7 @@ model AgentTask {
   createdBy   User        @relation("AgentTaskCreator", fields: [createdById], references: [id], onDelete: Cascade)
   createdById String      @map("created_by_id") @db.Uuid
   runnerJobs  RunnerJob[]
+  findings    Finding[]
 
   @@unique([id, workspaceId])
   @@index([workspaceId])
@@ -698,6 +700,33 @@ model AgentTask {
   @@map("agent_tasks")
 }
 
+model Finding {
+  id          String  @id @default(uuid()) @db.Uuid
+  workspaceId String  @map("workspace_id") @db.Uuid
+  taskId      String? @map("task_id") @db.Uuid
+
+  agentId String @map("agent_id")
+  type    String
+  title   String
+  data    Json
+  summary String @db.Text
+  // Note: vector dimension (1536) must match EMBEDDING_DIMENSION constant in @mosaic/shared
+  embedding Unsupported("vector(1536)")?
+
+  createdAt DateTime @default(now()) @map("created_at") @db.Timestamptz
+  updatedAt DateTime @updatedAt @map("updated_at") @db.Timestamptz
+
+  workspace Workspace @relation(fields: [workspaceId], references: [id], onDelete: Cascade)
+  task      AgentTask? @relation(fields: [taskId], references: [id], onDelete: SetNull)
+
+  @@unique([id, workspaceId])
+  @@index([workspaceId])
+  @@index([agentId])
+  @@index([type])
+  @@index([taskId])
+  @@map("findings")
+}
+
 model AgentSession {
   id          String  @id @default(uuid()) @db.Uuid
   workspaceId String  @map("workspace_id") @db.Uuid