fix(db): derive DATABASE_URL from POSTGRES_PASSWORD and harden credential sync

Stop web/scraper containers from using a stray literal DATABASE_URL in the
root .env (which desynced the postgres role password and caused persistent
'password authentication failed' errors). DATABASE_URL is now always computed
from POSTGRES_USER/POSTGRES_PASSWORD.

Also harden postgres-entrypoint.sh: log to stderr, retry on failure, and run
ALTER ROLE unconditionally so the stored password always matches the env.

docker-compose.yml

@@ -34,7 +34,7 @@ services:
     ports:
       - "${WEB_PORT:-3000}:3000"
     environment:
-      DATABASE_URL: "${DATABASE_URL:-postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@db:5432/${POSTGRES_DB:-jobsboard}?schema=public}"
+      DATABASE_URL: "postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@db:5432/${POSTGRES_DB:-jobsboard}?schema=public"
       NEXTAUTH_SECRET: "${NEXTAUTH_SECRET:-jobsboard-secret-key-for-auth-sessions}"
       NEXTAUTH_URL: "${NEXTAUTH_URL:-http://localhost:3000}"
       NODE_ENV: "production"
@@ -55,7 +55,7 @@ services:
     container_name: jobsboard_scraper
     restart: always
     environment:
-      DATABASE_URL: "${DATABASE_URL:-postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@db:5432/${POSTGRES_DB:-jobsboard}?schema=public}"
+      DATABASE_URL: "postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@db:5432/${POSTGRES_DB:-jobsboard}?schema=public"
       SCRAPE_INTERVAL_MINUTES: "30"
       SOCKS5_PROXY: "${SOCKS5_PROXY:-}"
       PROXY_URL: "${PROXY_URL:-}"

postgres-entrypoint.sh

@@ -1,7 +1,10 @@
 #!/bin/sh
 set -e
 
-# Run background synchronization once PostgreSQL is up on local unix socket
+# Re-align the Postgres role password with POSTGRES_PASSWORD on every boot.
+# Connects via the local unix socket (pg_hba "trust"), so it works even when
+# TCP password auth is currently broken. Runs in the background so it does not
+# block server startup, but retries until it succeeds.
 sync_credentials() {
   until pg_isready -q -h /var/run/postgresql; do
     sleep 0.5
@@ -10,17 +13,26 @@ sync_credentials() {
   USER="${POSTGRES_USER:-postgres}"
   PASS="${POSTGRES_PASSWORD:-postgres}"
 
-  psql -v ON_ERROR_STOP=0 -h /var/run/postgresql -U postgres -d postgres <<-EOSQL >/dev/null 2>&1
+  for i in $(seq 1 30); do
+    if psql -v ON_ERROR_STOP=1 -h /var/run/postgresql -U postgres -d postgres <<-EOSQL 2>/dev/null
       DO \$\$
       BEGIN
         IF NOT EXISTS (SELECT FROM pg_catalog.pg_roles WHERE rolname = '$USER') THEN
           CREATE ROLE "$USER" WITH LOGIN SUPERUSER PASSWORD '$PASS';
-      ELSE
-        ALTER ROLE "$USER" WITH LOGIN SUPERUSER PASSWORD '$PASS';
         END IF;
+        ALTER ROLE "$USER" WITH LOGIN SUPERUSER PASSWORD '$PASS';
       END
       \$\$;
 EOSQL
+    then
+      echo "[entrypoint] Synchronized '$USER' role password." >&2
+      return 0
+    fi
+    echo "[entrypoint] Credential sync attempt $i failed, retrying..." >&2
+    sleep 1
+  done
+
+  echo "[entrypoint] WARNING: could not synchronize credentials." >&2
 }
 
 sync_credentials &