feat(Phase 4): Memory & Intelligence — memory, log, summarization, skills (#91)

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

apps/gateway/src/skills/skills.service.ts

@@ -0,0 +1,52 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { eq, type Db, skills } from '@mosaic/db';
+import { DB } from '../database/database.module.js';
+
+type Skill = typeof skills.$inferSelect;
+type NewSkill = typeof skills.$inferInsert;
+
+@Injectable()
+export class SkillsService {
+  constructor(@Inject(DB) private readonly db: Db) {}
+
+  async findAll(): Promise<Skill[]> {
+    return this.db.select().from(skills);
+  }
+
+  async findEnabled(): Promise<Skill[]> {
+    return this.db.select().from(skills).where(eq(skills.enabled, true));
+  }
+
+  async findById(id: string): Promise<Skill | undefined> {
+    const rows = await this.db.select().from(skills).where(eq(skills.id, id));
+    return rows[0];
+  }
+
+  async findByName(name: string): Promise<Skill | undefined> {
+    const rows = await this.db.select().from(skills).where(eq(skills.name, name));
+    return rows[0];
+  }
+
+  async create(data: NewSkill): Promise<Skill> {
+    const rows = await this.db.insert(skills).values(data).returning();
+    return rows[0]!;
+  }
+
+  async update(id: string, data: Partial<NewSkill>): Promise<Skill | undefined> {
+    const rows = await this.db
+      .update(skills)
+      .set({ ...data, updatedAt: new Date() })
+      .where(eq(skills.id, id))
+      .returning();
+    return rows[0];
+  }
+
+  async remove(id: string): Promise<boolean> {
+    const rows = await this.db.delete(skills).where(eq(skills.id, id)).returning();
+    return rows.length > 0;
+  }
+
+  async toggle(id: string, enabled: boolean): Promise<Skill | undefined> {
+    return this.update(id, { enabled });
+  }
+}