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+---
+name: drizzle
+description: Drizzle ORM schema and database guide. Use when working with database schemas (src/database/schemas/*), defining tables, creating migrations, or database model code. Triggers on Drizzle schema definition, database migrations, or ORM usage questions.
+---
+
+# Drizzle ORM Schema Style Guide
+
+## Configuration
+
+- Config: `drizzle.config.ts`
+- Schemas: `src/database/schemas/`
+- Migrations: `src/database/migrations/`
+- Dialect: `postgresql` with `strict: true`
+
+## Helper Functions
+
+Location: `src/database/schemas/_helpers.ts`
+
+- `timestamptz(name)`: Timestamp with timezone
+- `createdAt()`, `updatedAt()`, `accessedAt()`: Standard timestamp columns
+- `timestamps`: Object with all three for easy spread
+
+## Naming Conventions
+
+- **Tables**: Plural snake_case (`users`, `session_groups`)
+- **Columns**: snake_case (`user_id`, `created_at`)
+
+## Column Definitions
+
+### Primary Keys
+
+```typescript
+id: text('id')
+  .primaryKey()
+  .$defaultFn(() => idGenerator('agents'))
+  .notNull(),
+```
+
+ID prefixes make entity types distinguishable. For internal tables, use `uuid`.
+
+### Foreign Keys
+
+```typescript
+userId: text('user_id')
+  .references(() => users.id, { onDelete: 'cascade' })
+  .notNull(),
+```
+
+### Timestamps
+
+```typescript
+...timestamps,  // Spread from _helpers.ts
+```
+
+### Indexes
+
+```typescript
+// Return array (object style deprecated)
+(t) => [uniqueIndex('client_id_user_id_unique').on(t.clientId, t.userId)],
+```
+
+## Type Inference
+
+```typescript
+export const insertAgentSchema = createInsertSchema(agents);
+export type NewAgent = typeof agents.$inferInsert;
+export type AgentItem = typeof agents.$inferSelect;
+```
+
+## Example Pattern
+
+```typescript
+export const agents = pgTable(
+  'agents',
+  {
+    id: text('id')
+      .primaryKey()
+      .$defaultFn(() => idGenerator('agents'))
+      .notNull(),
+    slug: varchar('slug', { length: 100 })
+      .$defaultFn(() => randomSlug(4))
+      .unique(),
+    userId: text('user_id')
+      .references(() => users.id, { onDelete: 'cascade' })
+      .notNull(),
+    clientId: text('client_id'),
+    chatConfig: jsonb('chat_config').$type<LobeAgentChatConfig>(),
+    ...timestamps,
+  },
+  (t) => [uniqueIndex('client_id_user_id_unique').on(t.clientId, t.userId)],
+);
+```
+
+## Common Patterns
+
+### Junction Tables (Many-to-Many)
+
+```typescript
+export const agentsKnowledgeBases = pgTable(
+  'agents_knowledge_bases',
+  {
+    agentId: text('agent_id')
+      .references(() => agents.id, { onDelete: 'cascade' })
+      .notNull(),
+    knowledgeBaseId: text('knowledge_base_id')
+      .references(() => knowledgeBases.id, { onDelete: 'cascade' })
+      .notNull(),
+    userId: text('user_id')
+      .references(() => users.id, { onDelete: 'cascade' })
+      .notNull(),
+    enabled: boolean('enabled').default(true),
+    ...timestamps,
+  },
+  (t) => [primaryKey({ columns: [t.agentId, t.knowledgeBaseId] })],
+);
+```
+
+## Query Style
+
+**Always use `db.select()` builder API. Never use `db.query.*` relational API** (`findMany`, `findFirst`, `with:`).
+
+The relational API generates complex lateral joins with `json_build_array` that are fragile and hard to debug.
+
+### Select Single Row
+
+```typescript
+// ✅ Good
+const [result] = await this.db
+  .select()
+  .from(agents)
+  .where(eq(agents.id, id))
+  .limit(1);
+return result;
+
+// ❌ Bad: relational API
+return this.db.query.agents.findFirst({
+  where: eq(agents.id, id),
+});
+```
+
+### Select with JOIN
+
+```typescript
+// ✅ Good: explicit select + leftJoin
+const rows = await this.db
+  .select({
+    runId: agentEvalRunTopics.runId,
+    score: agentEvalRunTopics.score,
+    testCase: agentEvalTestCases,
+    topic: topics,
+  })
+  .from(agentEvalRunTopics)
+  .leftJoin(agentEvalTestCases, eq(agentEvalRunTopics.testCaseId, agentEvalTestCases.id))
+  .leftJoin(topics, eq(agentEvalRunTopics.topicId, topics.id))
+  .where(eq(agentEvalRunTopics.runId, runId))
+  .orderBy(asc(agentEvalRunTopics.createdAt));
+
+// ❌ Bad: relational API with `with:`
+return this.db.query.agentEvalRunTopics.findMany({
+  where: eq(agentEvalRunTopics.runId, runId),
+  with: { testCase: true, topic: true },
+});
+```
+
+### Select with Aggregation
+
+```typescript
+// ✅ Good: select + leftJoin + groupBy
+const rows = await this.db
+  .select({
+    id: agentEvalDatasets.id,
+    name: agentEvalDatasets.name,
+    testCaseCount: count(agentEvalTestCases.id).as('testCaseCount'),
+  })
+  .from(agentEvalDatasets)
+  .leftJoin(agentEvalTestCases, eq(agentEvalDatasets.id, agentEvalTestCases.datasetId))
+  .groupBy(agentEvalDatasets.id);
+```
+
+### One-to-Many (Separate Queries)
+
+When you need a parent record with its children, use two queries instead of relational `with:`:
+
+```typescript
+// ✅ Good: two simple queries
+const [dataset] = await this.db
+  .select()
+  .from(agentEvalDatasets)
+  .where(eq(agentEvalDatasets.id, id))
+  .limit(1);
+
+if (!dataset) return undefined;
+
+const testCases = await this.db
+  .select()
+  .from(agentEvalTestCases)
+  .where(eq(agentEvalTestCases.datasetId, id))
+  .orderBy(asc(agentEvalTestCases.sortOrder));
+
+return { ...dataset, testCases };
+```
+
+## Database Migrations
+
+See the `db-migrations` skill for the detailed migration guide.