added reminder

backend/app/reminders/notify.py

@@ -0,0 +1,19 @@
+from sqlalchemy.orm import Session
+
+from app.homelab.state import get_state, set_state
+
+NOTIFY_SEQ_KEY = "reminders_notify_seq"
+
+
+def get_notify_seq(db: Session) -> int:
+    raw = get_state(db, NOTIFY_SEQ_KEY)
+    try:
+        return int(raw or 0)
+    except ValueError:
+        return 0
+
+
+def bump_notify_seq(db: Session) -> int:
+    seq = get_notify_seq(db) + 1
+    set_state(db, NOTIFY_SEQ_KEY, str(seq))
+    return seq