Release v2.21.0
Backend Changes ⛔ Breaking Changes Feat(query)!: remove v1 http endpoints the ui no longer calls (@ysh-bot in #9260) Replace ai.enable_mcp with an optional ai.mcp config block (@SoumyaRaikwar in #9194) Fix(es): reject five unsupported elasticsearch config keys at startup (@ysh-bot in #9076) Feat(clickhouse): promote clickhouse storage feature gate to stable (@ysh-bot in #9058) ✨ New Features Feat(…