Add a typed, cached registry over the system_settings table so that
values which used to be hardcoded Go literals can be changed at runtime.
Schema (database/schema/schema.sql):
- Extend system_settings with setting_type, min_value, max_value,
requires_restart, and category columns (all ADD COLUMN IF NOT EXISTS,
nullable for backward compat with the original three rows).
- Seed rows for every tunable: session duration, password rules,
login lockout, auth/device rate limits, OPDS page size, tombstone TTL,
conversion cache TTL, sync queue interval/batch, and worker pool
size/cap. Seed values equal the previous hardcoded literals, so
behavior is unchanged on upgrade. ON CONFLICT DO NOTHING preserves
any admin-modified values.
Queries (queries.sql):
- Add UpsertSystemSetting (RETURNING *) so new keys without a seed row
can still be written through the API.
- Add GetSystemSettingFull + GetAllSystemSettingsFull returning the
full typed row.
- Refactor CleanupExpiredRefreshTokens to take the retention window as
a parameter (make_interval(secs => $1)) instead of the INTERVAL '7
days' literal, so it can follow a configurable session duration.
Registry (internal/database/settings_registry.go):
- SettingsRegistry holds an in-memory cache of all known settings,
populated by Load at startup and refreshed by Reload on writes.
- Typed domain getters (SessionDuration, PasswordRules, DeviceRateLimits,
TombstoneTTL, OpdsPageSize, ConversionCacheTTL, SyncQueueConfig,
WorkerPoolConfig, LoginLockout, AuthRateLimit, ...) with compiled-in
fallback defaults and min/max clamping, so a corrupt or missing row
can never break the app.
- SettingDefaults is the single source of truth for keys, types, bounds,
and human descriptions; All() exposes metadata + current values for
the admin UI/API.
The registry lives in the database package (rather than its own
internal/settings package) because a quirk in this custom go1.26.5
toolchain prevented the large handlers package from importing any
newly-created package; every consumer already imports database.
Tests: settings_registry_test.go covers default validity per type,
int clamping at both bounds, garbage-value fallback, and unknown-key
lookup.
john-okeefe
bc47450653