price pipeline

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/store/price_history.go

@@ -0,0 +1,41 @@
+package store
+
+import (
+	"context"
+	"time"
+)
+
+func (s *Store) UpsertPrice(ctx context.Context, instrumentID int32, fetchedAt time.Time, prix float64) error {
+	_, err := s.pool.Exec(ctx,
+		`INSERT INTO price_history (instrument_id, fetched_at, prix)
+		 VALUES ($1, $2, $3)
+		 ON CONFLICT (instrument_id, fetched_at) DO UPDATE SET prix = EXCLUDED.prix`,
+		instrumentID, fetchedAt, prix)
+	return err
+}
+
+// GetLastPrice retourne le dernier prix connu pour un instrument.
+func (s *Store) GetLastPrice(ctx context.Context, instrumentID int32) (float64, time.Time, error) {
+	var prix float64
+	var fetchedAt time.Time
+	err := s.pool.QueryRow(ctx,
+		`SELECT prix, fetched_at FROM price_history
+		 WHERE instrument_id = $1
+		 ORDER BY fetched_at DESC LIMIT 1`,
+		instrumentID).Scan(&prix, &fetchedAt)
+	return prix, fetchedAt, err
+}
+
+// CleanPastDays supprime pour chaque jour passé toutes les entrées sauf la dernière par instrument.
+func (s *Store) CleanPastDays(ctx context.Context) error {
+	_, err := s.pool.Exec(ctx, `
+		DELETE FROM price_history ph
+		WHERE ph.fetched_at::date < CURRENT_DATE
+		  AND ph.fetched_at < (
+		      SELECT MAX(ph2.fetched_at)
+		      FROM price_history ph2
+		      WHERE ph2.instrument_id = ph.instrument_id
+		        AND ph2.fetched_at::date = ph.fetched_at::date
+		  )`)
+	return err
+}