Sub-ticket of MARS-107 Mars appEvents conform to fleet standard (evolutiva-appevents-standard.md): add categoryId uuid FK->lookupOptions + seed appEventCategory group (16 canonical + practica/studentAssignment/assignment) + backfill 18 free-text values w/ mapping; add 4 promoted cols (httpStatus/durationMs/path/failureCode); add logError/logWarn/logInfo wrappers + pickKnown + isCritical sync-bypass; append-only trigger (GUC-bypass) AFTER appEventRelays sidecar cutover (replace detail.relay.delivered UPDATE pattern); replace level-only prune with 5-cat-security tiered retention; canonical v_appEvents_* views; legacy_events sink. Staged db+coder. BLOCKED on committed SSOT + Elazar priority call. · mars