Add json-columns module: JSON columns in Hibernate 7.4.14 (@JdbcTypeCode(SqlTypes.JSON)), JSONB querying, GIN/expression indexes, dirty checking, Jackson 3 vs 2 on PostgreSQL 18.6 and MySQL 8.0.46

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b6Kg9RWSTJzyz6KP9X

json-columns/scripts/versions.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# Writes output/00-versions.txt: the exact versions this module ran against.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+mkdir -p output
+{
+  echo "# java -version"
+  java -version 2>&1 | grep -v '^Picked up'
+  echo
+  echo "# resolved libraries (mvn dependency:list, default profile)"
+  mvn -B -q dependency:list -DincludeScope=test -DoutputFile=/dev/stdout 2>/dev/null \
+    | grep -E 'hibernate-core|jackson-(databind|core|annotations)|postgresql:|mysql-connector-j|spring-boot:jar|spring-data-jpa|jakarta.persistence-api' | sed 's/^ *//' | sort
+  echo
+  echo "# PostgreSQL server"
+  psql -h "${PGHOST:-127.0.0.1}" -p "${PGPORT:-55432}" -U postgres -Atc 'select version()'
+  echo
+  echo "# MySQL server"
+  mysql -h127.0.0.1 -P"${MYPORT:-53306}" -uroot -Ne 'select version()'
+} > output/00-versions.txt
+cat output/00-versions.txt