Database performance intelligence: current versions, EOL status, and benchmark-grounded performance profiles for PostgreSQL, MySQL, MariaDB, MongoDB, Redis, Elasticsearch, SQLite, Cassandra, CockroachDB, and SQL Server. Useful mid-task for infrastructure audits, database selection, and upgrade urgency checks. Live EOL data from endoflife.date; performance profiles from TPC-C, pgbench, sysbench, and YCSB benchmarks.