store: wake the routines accepted before the fire-forever fix (V-377)

Routines accepted before Vikunja #366 carry accepted_ts NULL and a live
reminder row. The tick loop reads accepted_ts to decide when a routine is
next due, so those rows have been silent since the fix landed, while the
reminder they still point at keeps firing on its own schedule.

Migration #19 cancels that reminder first, then dates the acceptance from
created_ts and lets the reminder id go. Order matters: the second update
clears the id the first one needs.

internal/store/migrations_test.go

@@ -3,6 +3,7 @@ package store
 import (
 	"context"
 	"testing"
+	"time"
 )
 
 func userVersion(t *testing.T, s *Store) int {
@@ -80,3 +81,69 @@ func TestCollapsedCalendarKeysAreDropped(t *testing.T) {
 		t.Fatalf("%d calendar rows left, want the 2 that identify their event", got)
 	}
 }
+
+// TestStuckRoutinesAreBackfilled — routines accepted before the fire-forever
+// fix have accepted_ts NULL and a live reminder, so the tick loop skips them
+// and they have been silent ever since (Vikunja #377). The migration touches
+// live reminders, which is why it is tested against a real store.
+func TestStuckRoutinesAreBackfilled(t *testing.T) {
+	ctx := context.Background()
+	s := newTestStore(t)
+	created := time.Date(2026, 7, 1, 9, 0, 0, 0, time.UTC)
+
+	rem, err := s.CreateReminder(ctx, created.Add(time.Hour), "полить цветы", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	healthy, err := s.CreateReminder(ctx, created.Add(2*time.Hour), "не трогать", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.db.ExecContext(ctx,
+		`INSERT INTO proposed_routines (action, object, interval_days, status, created_ts, reminder_id, accepted_ts)
+		 VALUES ('water', 'plants', 7, 'accepted', ?, ?, NULL)`,
+		created.UnixMilli(), rem); err != nil {
+		t.Fatal(err)
+	}
+	// An already-healthy accepted row, and a still-open proposal: neither is
+	// this migration's business.
+	if _, err := s.db.ExecContext(ctx,
+		`INSERT INTO proposed_routines (action, object, interval_days, status, created_ts, accepted_ts)
+		 VALUES ('feed', 'cat', 1, 'accepted', ?, ?)`,
+		created.UnixMilli(), created.UnixMilli()); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := s.db.ExecContext(ctx, migrations[18]); err != nil {
+		t.Fatalf("migration 19: %v", err)
+	}
+
+	accepted, err := s.ListAcceptedRoutines(ctx)
+	if err != nil || len(accepted) != 2 {
+		t.Fatalf("ListAcceptedRoutines = %d rows, err=%v, want 2", len(accepted), err)
+	}
+	stuck := accepted[0]
+	if stuck.Object != "plants" {
+		stuck = accepted[1]
+	}
+	if stuck.AcceptedTs == nil || !stuck.AcceptedTs.Equal(created) {
+		t.Fatalf("accepted_ts = %v, want the creation time", stuck.AcceptedTs)
+	}
+	if stuck.ReminderID != nil {
+		t.Fatalf("reminder_id = %v, want it let go", stuck.ReminderID)
+	}
+	// The reminder it was holding is cancelled, and nothing else is.
+	var status string
+	if err := s.db.QueryRowContext(ctx, `SELECT status FROM reminders WHERE id = ?`, rem).Scan(&status); err != nil {
+		t.Fatal(err)
+	}
+	if status != ReminderCancelled {
+		t.Fatalf("linked reminder status = %q, want cancelled", status)
+	}
+	if err := s.db.QueryRowContext(ctx, `SELECT status FROM reminders WHERE id = ?`, healthy).Scan(&status); err != nil {
+		t.Fatal(err)
+	}
+	if status != "pending" {
+		t.Fatalf("unrelated reminder status = %q, want it untouched", status)
+	}
+}