refactor(dev): share postgres across main and worktrees

scripts/ensure-postgres.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ENV_FILE="${1:-.env}"
+
+if [ ! -f "$ENV_FILE" ]; then
+  echo "Missing env file: $ENV_FILE"
+  echo "Create .env from .env.example, or run 'make worktree-env' and use .env.worktree."
+  exit 1
+fi
+
+set -a
+# shellcheck disable=SC1090
+. "$ENV_FILE"
+set +a
+
+POSTGRES_DB="${POSTGRES_DB:-multica}"
+POSTGRES_USER="${POSTGRES_USER:-multica}"
+POSTGRES_PASSWORD="${POSTGRES_PASSWORD:-multica}"
+
+export PGPASSWORD="$POSTGRES_PASSWORD"
+
+echo "==> Ensuring shared PostgreSQL container is running on localhost:5432..."
+docker compose up -d postgres
+
+echo "==> Waiting for PostgreSQL to be ready..."
+until docker compose exec -T postgres pg_isready -U "$POSTGRES_USER" -d postgres > /dev/null 2>&1; do
+  sleep 1
+done
+
+echo "==> Ensuring database '$POSTGRES_DB' exists..."
+db_exists="$(docker compose exec -T postgres \
+  psql -U "$POSTGRES_USER" -d postgres -Atqc "SELECT 1 FROM pg_database WHERE datname = '$POSTGRES_DB'")"
+
+if [ "$db_exists" != "1" ]; then
+  docker compose exec -T postgres \
+    psql -U "$POSTGRES_USER" -d postgres -v ON_ERROR_STOP=1 \
+    -c "CREATE DATABASE \"$POSTGRES_DB\"" \
+    > /dev/null
+fi
+
+echo "✓ PostgreSQL ready. Application database: $POSTGRES_DB"