Drizzle Agent Skill

Drizzle ORM (this repo)

Drizzle is used in exactly one place: internal-packages/dashboard-agent-db (@internal/dashboard-agent-db), the in-dashboard agent's conversation store. Everything else in the monorepo is Prisma (@trigger.dev/database). Keep them separate.

Pinned versions: drizzle-orm ^0.45, drizzle-kit ^0.31 (dev), postgres ^3.4 (postgres.js driver). drizzle-orm and drizzle-kit are intentionally on different version lines — 0.31.x is the correct companion for 0.45.x, there is no peer dependency between them.

Critical rules

• Drizzle is only the agent's own datastore. The agent (and its task bundle) must have no access to the main Prisma database or ClickHouse. Never import the Prisma client into the agent task or into @internal/dashboard-agent-db. Main data is reached via the API, not Drizzle.
• Foreign-key-free. In cloud this DB is a *separate* PlanetScale database, so it can't FK into the main DB. Reference main entities (organizationId, userId, …) by id only — never .references(). Joins happen in app code; tenant scoping is enforced in the query layer.
• One dedicated Postgres schema. All tables live under pgSchema("trigger_dashboard_agent") so they're schema-qualified and isolated from Prisma's public schema (this is what makes the OSS single-database fallback safe).
• Pooler-safe connections. Connections go through a transaction-mode pooler (PlanetScale / PgBouncer-style), so postgres.js must run with prepare: false — prepared statements don't survive a connection being handed to another client between checkouts.
• Node16 module resolution. Relative imports need explicit .js extensions (import { chats } from "./schema.js"), even though the source is .ts.
• Scope every user query. All queries that touch user data go through src/queries.ts and are scoped by organizationId / userId, so callers can't forget the where. Don't write ad-hoc cross-tenant queries elsewhere.

Package layout

internal-packages/dashboard-agent-db/
  drizzle.config.ts      # drizzle-kit config (schema path, out dir, schemaFilter)
  drizzle/               # generated migrations (committed)
  src/
    schema.ts            # pgSchema + table definitions
    client.ts            # createDashboardAgentDb() — postgres.js + drizzle
    queries.ts           # the access-pattern layer (org/user-scoped)
    index.ts             # barrel: re-exports schema, client, queries

package.json points main/types at ./src/index.ts (consumed as source, no build step) — same as other simple internal packages.

Schema (pg-core)

Use pgSchema(...).table(...), not the bare pgTable, so tables land in the dedicated schema. (schemas, pg column types, indexes)

import { sql } from "drizzle-orm";
import { index, jsonb, pgSchema, text, timestamp } from "drizzle-orm/pg-core";

export const dashboardAgentSchema = pgSchema("trigger_dashboard_agent");

export const chats = dashboardAgentSchema.table(
  "chats",
  {
    id: text("id").primaryKey(),
    organizationId: text("organization_id").notNull(), // FK-free: id only, no .references()
    userId: text("user_id").notNull(),
    title: text("title").notNull().default("New chat"),
    // JSONB with a typed view; .default([]) / .default({}) emit '[]'::jsonb / '{}'::jsonb
    messages: jsonb("messages").$type<unknown[]>().notNull().default([]),
    metadata: jsonb("metadata").$type<Record<string, unknown>>().notNull().default({}),
    deletedAt: timestamp("deleted_at", { withTimezone: true }), // soft delete
    lastMessageAt: timestamp("last_message_at", { withTimezone: true }),
    createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
  },
  // Extra config returns an ARRAY in drizzle-orm 0.36+ (not an object).
  (t) => [
    // Partial + ordered composite index. `.desc()` on the column, `.where(sql`...`)` for partial.
    index("chats_org_user_last_msg_idx")
      .on(t.organizationId, t.userId, t.lastMessageAt.desc())
      .where(sql`${t.deletedAt} is null`),
  ]
);

// Inferred row types for the query layer + consumers.
export type Chat = typeof chats.$inferSelect;
export type NewChat = typeof chats.$inferInsert;

Notes:

• timestamp(..., { withTimezone: true }) → timestamp with time zone. Use .defaultNow() for DEFAULT now().
• For a "newest first, nulls last" sort the partial index uses .desc(); the *query* uses raw sql for NULLS LAST (see below).
• Don't add .references() — see critical rule 2.

Client (postgres.js + drizzle)

(connect overview) One small pool, prepare: false. In the agent task create it once in onBoot (per-process); in the webapp wrap it in the singleton(...) helper.

import { drizzle, type PostgresJsDatabase } from "drizzle-orm/postgres-js";
import postgres, { type Sql } from "postgres";
import * as schema from "./schema.js";

export type DashboardAgentDb = PostgresJsDatabase<typeof schema>;

export function createDashboardAgentDb(connectionString: string, opts: { max?: number } = {}) {
  const sql: Sql = postgres(connectionString, {
    max: opts.max ?? 5,        // small — the pooler does the real pooling
    idle_timeout: 20,          // release conns when an agent run suspends
    prepare: false,            // REQUIRED for transaction-mode poolers
  });
  return { db: drizzle(sql, { schema }), sql, close: () => sql.end() };
}

Queries (the access-pattern layer)

(select, insert, operators, transactions, joins)

import { and, desc, eq, isNull, sql } from "drizzle-orm";

// Select EXPLICIT columns for list views — never select a large blob (messages)
// or a secret (tokens) you don't need. `NULLS LAST` needs raw sql in orderBy.
await db
  .select({ id: chats.id, title: chats.title, lastMessageAt: chats.lastMessageAt })
  .from(chats)
  .where(and(eq(chats.organizationId, orgId), eq(chats.userId, userId), isNull(chats.deletedAt)))
  .orderBy(sql`${chats.pinnedAt} desc nulls last`, desc(chats.lastMessageAt))
  .limit(50);

// Idempotent create (avoids a duplicate-key race between two writers).
await db.insert(chats).values({ id, organizationId: orgId, userId }).onConflictDoNothing();

// Upsert.
await db
  .insert(chatSessions)
  .values({ chatId, publicAccessToken })
  .onConflictDoUpdate({ target: chatSessions.chatId, set: { publicAccessToken, updatedAt: sql`now()` } });

// Owner-scope a join (this DB is FK-free, so enforce ownership in the query).
await db
  .select({ /* session cols */ })
  .from(chatSessions)
  .innerJoin(chats, eq(chats.id, chatSessions.chatId))
  .where(and(eq(chatSessions.chatId, chatId), eq(chats.userId, userId)));

// Multi-write that must be consistent on the next read → one transaction.
await db.transaction(async (tx) => {
  await tx.update(chats).set({ messages, updatedAt: sql`now()` }).where(eq(chats.id, chatId));
  await tx.insert(chatSessions).values({ /* ... */ }).onConflictDoUpdate({ /* ... */ });
});

Use sql\now()\ for DB-side timestamps in updates.

Migrations (drizzle-kit)

(kit overview, generate, migrate)

drizzle.config.ts must set schemaFilter so drizzle-kit only ever manages our schema — never Prisma's public (critical in the OSS single-DB fallback):

import { defineConfig } from "drizzle-kit";
export default defineConfig({
  schema: "./src/schema.ts",
  out: "./drizzle",
  dialect: "postgresql",
  schemaFilter: ["trigger_dashboard_agent"],
  dbCredentials: { url: process.env.DASHBOARD_AGENT_DATABASE_URL ?? process.env.DATABASE_URL ?? "postgres://placeholder" },
});

Workflow:

cd internal-packages/dashboard-agent-db
pnpm run db:generate   # diff schema.ts → emit SQL into drizzle/. OFFLINE (no DB needed).
#   review the generated drizzle/000N_*.sql before committing
pnpm run db:migrate    # apply pending migrations. Needs a real DATABASE URL.

• db:generate is offline — it only reads schema.ts, so you can verify a schema change compiles to valid DDL with no database. Use it as a fast check.
• drizzle-kit names migration files with a random suffix (0000_magenta_lilandra.sql). Don't regenerate a committed migration just to "refresh" it — that churns the filename. After the first migration is committed, schema changes produce a new 000N_*.sql; commit that.
• Generated DDL for a new schema is one CREATE SCHEMA + schema-qualified CREATE TABLEs + indexes, no foreign keys (by design here).

Common gotchas

• prepare: false is not optional with a pooler — without it you'll get prepared-statement errors under load.
• Missing .js extension on a relative import → TS2835 under Node16 resolution.
• Extra-config callback returns an array (t) => [ ... ] in drizzle-orm 0.36+. The old object form (t) => ({ ... }) is deprecated.
• NULLS LAST / NULLS FIRST aren't on the desc() helper — use raw sql\col desc nulls last\ in orderBy.
• Don't SELECT * into list views — explicitly pick columns so you never ship a megabyte messages blob or a session token to a list query.
• Adding a dependency: edit package.json, then pnpm i from the repo root (never pnpm add). Mind the repo's minimumReleaseAge (3 days) — pin with a caret range and let pnpm resolve an old-enough version.

Reference (official docs)

• Schema declaration — https://orm.drizzle.team/docs/sql-schema-declaration
• PostgreSQL column types — https://orm.drizzle.team/docs/column-types/pg
• Schemas (pgSchema) — https://orm.drizzle.team/docs/schemas
• Indexes & constraints — https://orm.drizzle.team/docs/indexes-constraints
• Connect (postgres-js) — https://orm.drizzle.team/docs/connect-overview
• Select / Insert / Update / Delete — https://orm.drizzle.team/docs/select · /insert · /update · /delete
• Joins / Operators — https://orm.drizzle.team/docs/joins · /operators
• Transactions — https://orm.drizzle.team/docs/transactions
• drizzle-kit (generate / migrate / push) — https://orm.drizzle.team/docs/kit-overview