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+# Data storage, cron, and upgrades
+
+Use this file when adding persistent storage, background jobs, or upgrade routines.
+
+## Data storage
+
+- Prefer Options API for small config/state.
+- Use custom tables only when needed; store schema version and provide upgrade paths.
+
+## Cron
+
+- Ensure tasks are idempotent (may run late or multiple times).
+- Provide a manual trigger path for debugging (WP-CLI or admin-only action).
+
+## Database safety note
+
+If using `$wpdb->prepare()`, avoid building queries with concatenated user input.
+Recent WordPress versions support identifier placeholders (`%i`) but you must not assume it exists without checking capabilities or target versions.
+