chore: add database maintenance and home copy tasks

2026-06-02 10:50:35 +02:00
parent 341107e227
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+---
+id: TASK-db-retention-audit
+title: Audit database retention strategy
+status: pending
+type: research
+team: Arquitecto de Base de Datos
+supporting_teams: [Backend Senior, Arquitecto Python, PM]
+roadmap_item: historical-data-maintenance
+priority: high
+---
+
+# TASK-db-retention-audit - Audit database retention strategy
+
+## Goal
+
+Audit the current HLL Vietnam database/storage model and produce a precise retention strategy before any destructive cleanup is implemented.
+
+## Context
+
+The project stores live and historical RCON data, materialized matches, precomputed snapshots, player/event data and server snapshots.
+
+We need to prevent the database from growing indefinitely, but we must not delete data required for:
+
+- the latest 100 visible matches;
+- current weekly leaderboards;
+- previous-week fallback leaderboards;
+- current monthly leaderboards;
+- previous-month fallback leaderboards during the first 7 days of a new month;
+- current or recent RCON materialization;
+- current-match/live pages.
+
+Important architectural decision:
+Do not use native database scheduling, `pg_cron` or an external cron service for now. The future cleanup should be application-level, versioned, logged and executed from the existing `historical-runner`.
+
+Known snapshot context:
+Precomputed display snapshots should already be bounded because PostgreSQL stores them in `displayed_historical_snapshots` using a logical primary key `(server_key, snapshot_type, metric, snapshot_window)` and persistence uses upsert semantics. File-based snapshots also use deterministic paths by server/type/metric. This task must verify that assumption against the current code.
+
+## Steps
+
+1. Inspect the listed files first.
+2. Identify all tables/files involved in:
+   - RCON admin log events;
+   - RCON materialized matches;
+   - materialized player stats;
+   - server snapshots;
+   - displayed historical snapshots;
+   - player event raw ledger;
+   - Elo/MMR tables if present;
+   - monthly rankings/checkpoints if present.
+3. Determine which data is safe to delete and when.
+4. Determine which data must be protected.
+5. Determine the safe delete order to avoid orphan data.
+6. Determine whether any foreign keys/cascade rules exist or are missing.
+7. Create a concise retention audit document.
+
+## Files to Read First
+
+- `AGENTS.md`
+- `ai/repo-context.md`
+- `ai/architecture-index.md`
+- `backend/app/postgres_display_storage.py`
+- `backend/app/historical_snapshot_storage.py`
+- `backend/app/historical_runner.py`
+- `backend/app/rcon_historical_worker.py`
+- `backend/app/rcon_historical_read_model.py`
+- `backend/app/rcon_historical_backfill.py`
+- `backend/app/player_event_aggregates.py`
+
+## Expected Files to Modify
+
+- `ai/tasks/pending/TASK-db-retention-audit.md`
+- `ai/reports/database-retention-audit.md`
+
+If `ai/reports/*.md` is ignored by Git, create the report in:
+
+- `ai/tasks/review/TASK-db-retention-audit-report.md`
+
+and explain why in the outcome.
+
+## Constraints
+
+- Do not implement cleanup logic in this task.
+- Do not delete data.
+- Do not modify backend runtime behavior.
+- Do not add Docker services.
+- Do not touch `main` directly.
+- Keep the report factual and based on the actual schema/code.
+- Clearly separate confirmed facts from assumptions.
+- Do not expand Elo/MMR functionality.
+
+## Retention Rules To Validate
+
+The future cleanup must protect:
+
+- latest 100 closed/materialized matches;
+- all matches from current month;
+- all matches from previous month while `now.day <= 7`;
+- all matches from current week;
+- all matches from previous week if weekly fallback logic may still need them;
+- child/player-stat rows belonging to protected matches;
+- snapshot records currently addressed by frontend endpoints;
+- current RCON/live data.
+
+Candidate cleanup areas:
+
+- old `server_snapshots`;
+- non-critical old `rcon_admin_log_events`;
+- old critical admin log events only after retention and protection checks;
+- old materialized matches not protected by latest-100/month/week rules;
+- child stats for deleted materialized matches;
+- legacy/corrupt duplicate snapshots only if actually found.
+
+AdminLog critical events:
+
+- `kill`
+- `match_start`
+- `match_end`
+
+AdminLog non-critical events:
+
+- `chat`
+- `message`
+- `connected`
+- `disconnected`
+- `team_switch`
+- `unknown`
+- `kick`
+- `ban`
+- any other event not required for materialized stats/rankings.
+
+## Validation
+
+Run:
+
+```powershell
+python -m compileall backend/app
+git diff --check
+```
+
+Also include recommended SQL audit commands in the report:
+
+```sql
+select
+  schemaname,
+  relname as table_name,
+  pg_size_pretty(pg_total_relation_size(relid)) as total_size,
+  pg_size_pretty(pg_relation_size(relid)) as table_size,
+  pg_size_pretty(pg_total_relation_size(relid) - pg_relation_size(relid)) as indexes_size,
+  n_live_tup as estimated_rows,
+  n_dead_tup as estimated_dead_rows
+from pg_stat_user_tables
+order by pg_total_relation_size(relid) desc;
+```
+
+and table-specific row/age queries for the actual tables found.
+
+## Outcome
+
+Document:
+
+- files inspected;
+- tables/storage areas audited;
+- safe-to-delete data;
+- protected data;
+- required delete order;
+- risks;
+- missing indexes/constraints if any;
+- recommended implementation plan for the cleanup command.
+
+Codex CLI must commit and push the completed task branch.
+
+Suggested implementation branch:
+
+`task/db-retention-audit`
+
+Suggested commit message:
+
+`docs: audit database retention strategy`
+
+## Change Budget
+
+Prefer fewer than 3 modified files.
+No runtime changes.
+No product code changes.