make database pool size configurable

Author: stplasim

.env.example

@@ -2,3 +2,4 @@ SLACK_BOT_TOKEN=xoxb-
 SLACK_APP_TOKEN=xapp-
 GITHUB_TOKEN=github_pat_
 DATABASE_URL=postgres://root:password@localhost:5432/app
+# DB_POOL_MAX=10

installation.md

@@ -46,6 +46,7 @@ DATABASE_URL=postgres://user:password@localhost/releases_db
 # Optional
 # POLL_CRON=0 * * * *        # How often to check releases (default: every hour)
 # DIGEST_CRON=30 7 * * *     # When to send the periodic digest in UTC (default: 07:30 UTC)
+# DB_POOL_MAX=10             # Max connections in the DB connection pool (default: 10)
 ```
 
 All tables are created in the `main` PostgreSQL schema. To use a different schema, change the hardcoded value in `src/db/schema.ts` and `drizzle.config.ts`, then regenerate and re-apply migrations.

src/db/client.ts

@@ -1,7 +1,9 @@
 import { drizzle } from 'drizzle-orm/bun-sql'
+import { positiveInt, requiredString } from '@utils/env'
 
-if (!process.env.DATABASE_URL) {
-  throw new Error('DATABASE_URL is required')
-}
-
-export const db = drizzle(process.env.DATABASE_URL)
+export const db = drizzle({
+  connection: {
+    url: requiredString('DATABASE_URL'),
+    max: positiveInt('DB_POOL_MAX', 10),
+  },
+})

src/env.d.ts

@@ -9,6 +9,7 @@ declare module 'bun' {
 
     // Database
     DATABASE_URL: string
+    DB_POOL_MAX?: string
     // Jobs
     POLL_CRON?: string
     DIGEST_CRON?: string

tsconfig.json

@@ -13,11 +13,12 @@
     "noEmit": true,
     "skipLibCheck": true,
     "paths": {
-      "@db/*":       ["./src/db/*"],
-      "@forges/*":   ["./src/forges/*"],
-      "@bot/*":      ["./src/slack/*"],
-      "@jobs/*":     ["./src/jobs/*"],
-      "@classify/*": ["./src/classify/*"]
+      "@db/*": ["./src/db/*"],
+      "@forges/*": ["./src/forges/*"],
+      "@bot/*": ["./src/slack/*"],
+      "@jobs/*": ["./src/jobs/*"],
+      "@classify/*": ["./src/classify/*"],
+      "@utils/*": ["./src/utils/*"]
     }
   }
 }