chore: import upstream snapshot with attribution

internal-packages/dashboard-agent-db/drizzle.config.ts

@@ -0,0 +1,25 @@
+import { defineConfig } from "drizzle-kit";
+
+// Migrations need a direct (non-pooler) connection; a transaction-mode pooler
+// can't run the migrator. Prefer the agent's direct url, then its pooled url,
+// then the main DIRECT_URL/DATABASE_URL (OSS single-database fallback; tables
+// still land in the trigger_dashboard_agent schema).
+const url =
+  process.env.DASHBOARD_AGENT_DIRECT_URL ??
+  process.env.DASHBOARD_AGENT_DATABASE_URL ??
+  process.env.DIRECT_URL ??
+  process.env.DATABASE_URL ??
+  "postgres://placeholder"; // generate is offline; a real url is only needed for migrate/studio
+
+export default defineConfig({
+  schema: "./src/schema.ts",
+  out: "./drizzle",
+  dialect: "postgresql",
+  // Only manage our schema — never introspect or diff Prisma's `public` schema.
+  schemaFilter: ["trigger_dashboard_agent"],
+  // Own journal table so dev (`drizzle-kit migrate`) and deploy (migrate.mjs)
+  // share one history and we don't cross-poison the default
+  // drizzle.__drizzle_migrations when the DB is shared. See migrate.mjs.
+  migrations: { table: "__dashboard_agent_migrations", schema: "drizzle" },
+  dbCredentials: { url },
+});