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geniusrun/backend/internal/store/migrations/0002_sync_state.sql

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-- Tracks how far back a full backfill has already reached. Garmin activity
-- history is immutable once recorded, so once we've backfilled a historical
-- window there is no need to ever re-fetch get_activities() for it again --
-- this is the "cache" that lets repeated backfills be cheap/fast instead of
-- re-walking years of history against Garmin's API every time.
CREATE TABLE sync_state (
id INTEGER PRIMARY KEY CHECK (id = 1),
earliest_synced_date TEXT,
backfill_complete INTEGER NOT NULL DEFAULT 0
);
INSERT INTO sync_state (id, earliest_synced_date, backfill_complete) VALUES (1, NULL, 0);