Add hibernate-jpa module: 40 runnable Hibernate 7 / JPA interview answers on PostgreSQL 16

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cfo2K4u4rF18QsPXPFnytf

hibernate-jpa/scripts/start-postgres.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# Starts a throwaway PostgreSQL on port 5433 with a database called "lab" (needs PostgreSQL binaries installed).
+# Run as a non-root user. Adjust PGBIN for your platform.
+set -euo pipefail
+PGBIN="${PGBIN:-/usr/lib/postgresql/16/bin}"
+DATA="${PGDATA_DIR:-/tmp/pg-lab/data}"
+mkdir -p "$(dirname "$DATA")"
+[ -d "$DATA" ] || "$PGBIN/initdb" -D "$DATA" -A trust -U postgres >/dev/null
+"$PGBIN/pg_ctl" -D "$DATA" -o "-p 5433 -k /tmp" -l "$(dirname "$DATA")/pg.log" start
+sleep 2
+psql -h localhost -p 5433 -U postgres -tc "select 1 from pg_database where datname='lab'" | grep -q 1 \
+  || psql -h localhost -p 5433 -U postgres -c "create database lab"