chore: add database maintenance and home copy tasks
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devRaGonSa
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ai/tasks/pending/TASK-database-maintenance-cleanup-command.md
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ai/tasks/pending/TASK-database-maintenance-cleanup-command.md
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id: TASK-database-maintenance-cleanup-command
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title: Add database maintenance cleanup command
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status: pending
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type: backend
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team: Backend Senior
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supporting_teams: [Arquitecto de Base de Datos, Arquitecto Python]
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roadmap_item: historical-data-maintenance
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priority: high
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---
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# TASK-database-maintenance-cleanup-command - Add database maintenance cleanup command
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## Goal
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Implement a safe backend cleanup command with dry-run/apply modes to remove database data that is no longer needed while preserving all data required for visible history and leaderboards.
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## Context
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The project should keep the database bounded without manually deleting data.
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The command will later be scheduled from historical-runner, but this task only implements the cleanup module and tests.
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The cleanup must not rely on native PostgreSQL scheduling or a new Docker service.
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The cleanup must protect:
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- latest 100 closed/materialized matches;
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- current month;
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- previous month during the first 7 days of the new month;
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- current week;
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- previous week if fallback weekly logic may need it;
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- child/player stats for protected matches;
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- current live/RCON data.
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## Steps
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1. Inspect the listed files first.
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2. Add a backend module for database maintenance.
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3. Provide a CLI entry point:
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- `python -m app.database_maintenance cleanup --dry-run`
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- `python -m app.database_maintenance cleanup --apply`
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4. Make dry-run the default behavior.
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5. Add JSON logs for planning, batches and completion.
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6. Add tests.
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7. Validate locally.
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8. Commit and push the task branch.
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## Files to Read First
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- `AGENTS.md`
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- `backend/app/config.py`
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- `backend/app/postgres_display_storage.py`
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- `backend/app/historical_runner.py`
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- `backend/app/rcon_historical_read_model.py`
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- `backend/app/rcon_historical_backfill.py`
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- `backend/tests/`
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## Expected Files to Modify
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- `backend/app/database_maintenance.py`
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- `backend/app/config.py`
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- `backend/tests/test_database_maintenance.py`
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Optional only if required by existing test helpers:
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- `backend/tests/conftest.py`
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- `backend/tests/test_*.py`
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Do not modify frontend files in this task.
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## Functional Requirements
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Create a cleanup command:
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```powershell
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python -m app.database_maintenance cleanup --dry-run
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python -m app.database_maintenance cleanup --apply
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```
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Supported options:
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- `--recent-matches-keep`
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- `--admin-log-noncritical-retention-days`
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- `--admin-log-critical-retention-days`
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- `--server-snapshot-retention-days`
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- `--batch-size`
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- `--vacuum-analyze`
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- `--now`
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Environment defaults:
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- `HLL_RECENT_MATCHES_KEEP=100`
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- `HLL_ADMIN_LOG_NONCRITICAL_RETENTION_DAYS=30`
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- `HLL_ADMIN_LOG_CRITICAL_RETENTION_DAYS=90`
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- `HLL_SERVER_SNAPSHOT_RETENTION_DAYS=14`
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- `HLL_DB_MAINTENANCE_BATCH_SIZE=5000`
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Dry-run behavior:
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- calculate all candidate rows;
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- do not delete anything;
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- log exactly what would be deleted;
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- return status ok.
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Apply behavior:
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- delete only candidate rows;
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- delete in batches;
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- use transactions safely;
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- do not block indefinitely;
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- log deleted row counts;
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- return status ok even if deleted counts are zero.
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Retention Logic
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Protected materialized matches:
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- latest N closed matches, default N = 100;
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- current month matches;
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- previous month matches if now.day <= 7;
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- current week matches;
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- previous week matches if weekly fallback may need them;
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- any match whose end/start timestamp cannot be safely interpreted should be skipped/protected, not deleted.
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Delete materialized matches only if:
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- not in protected latest N;
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- not in protected current/previous month window;
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- not in protected current/previous week window;
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- older than the relevant protected windows;
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- child stats/events that depend on the match are handled first.
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AdminLog critical events:
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- `kill`
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- `match_start`
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- `match_end`
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Critical events may only be deleted after `HLL_ADMIN_LOG_CRITICAL_RETENTION_DAYS` and only if they are not needed for protected materialized matches/windows.
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AdminLog non-critical events may be deleted after `HLL_ADMIN_LOG_NONCRITICAL_RETENTION_DAYS`.
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Server snapshots may be deleted after `HLL_SERVER_SNAPSHOT_RETENTION_DAYS`.
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`displayed_historical_snapshots` should not be routinely deleted because it is keyed/upserted. Only skip or report suspicious legacy/corrupt records; do not aggressively delete snapshots in this task.
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## Safety Requirements
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- If an optional table does not exist, log a controlled skip and continue.
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- If PostgreSQL URL is not configured and the app is in SQLite mode, either support SQLite safely or return a clear unsupported message, depending on existing architecture.
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- Do not leave orphan rows.
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- Do not delete from unrelated Elo/MMR tables unless the audit proves exact dependency and task scope is explicitly updated.
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- Use existing project lock/writer-lock patterns if present.
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- Cleanup failure must produce JSON error output.
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## Required JSON Log Events
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At minimum:
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- `database-maintenance-started`
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- `database-maintenance-plan`
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- `database-maintenance-table-skipped`
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- `database-maintenance-delete-batch`
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- `database-maintenance-completed`
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- `database-maintenance-error`
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## Tests
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Create `backend/tests/test_database_maintenance.py`.
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Minimum cases:
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- dry-run does not delete.
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- apply deletes old server snapshots.
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- apply deletes old non-critical admin log events.
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- apply preserves critical events within retention.
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- apply preserves latest 100 materialized matches.
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- apply preserves current month matches.
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- apply preserves previous month when now.day <= 7.
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- apply preserves current week.
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- apply preserves previous week when fallback protection applies.
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- apply deletes an old non-protected materialized match.
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- child/player stats for deleted matches are deleted first or handled without orphans.
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- missing optional tables are logged and do not crash cleanup.
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## Validation
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Run:
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```powershell
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PYTHONPATH=backend python -m unittest backend.tests.test_database_maintenance
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python -m compileall backend/app
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git diff --check
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```
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Also manually run:
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```powershell
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docker compose exec backend python -m app.database_maintenance cleanup --dry-run
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```
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or, if backend container is unavailable:
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```powershell
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cd backend
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python -m app.database_maintenance cleanup --dry-run
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```
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Document which one was used.
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## Outcome
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Document:
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- validation commands run;
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- dry-run output summary;
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- any existing unrelated test failures;
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- exact files changed;
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- any follow-up task needed instead of expanding scope.
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Codex CLI must commit and push the completed task branch.
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Suggested implementation branch:
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`task/database-maintenance-cleanup-command`
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Suggested commit message:
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`feat: add database maintenance cleanup command`
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## Change Budget
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Prefer fewer than 5 modified files.
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Prefer focused backend-only changes.
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Split follow-up tasks if implementation exceeds safe scope.
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