feat(#2635): consolidate todos + reminders into one hyperhive-state.sqlite

hive-agent/src/main.rs

@@ -10,6 +10,7 @@
 //! before lib + bin were collapsed into one) plus the serve loop.
 
 mod client;
+mod db_migrate;
 mod events;
 mod forge_notify;
 mod harness_state;
@@ -467,6 +468,19 @@ async fn serve_main<S: Surface>(socket: &Path, poll_ms: u64) -> Result<()> {
     // never observes a "closed" state. Opened before the todo socket
     // below so the same `Arc` can be handed to its request dispatch
     // (reminder ops share the todo socket/listener).
+    // Fold the pre-consolidation per-concern db files into the single
+    // `hyperhive-state.sqlite`, if this is the first boot since the
+    // upgrade — see `db_migrate` module docs. Best-effort: a failure here
+    // just leaves the legacy file(s) in place to retry next boot, so the
+    // subsystems below still start (`Todos`/`Reminders::open` create the
+    // schema fresh if nothing migrated across).
+    if let Err(e) = db_migrate::run(
+        &paths::state_db(),
+        &paths::legacy_todos_db(),
+        &paths::legacy_reminders_db(),
+    ) {
+        tracing::warn!(error = ?e, "legacy db_migrate failed — continuing with fresh/partial state db");
+    }
     let (reminder_tx, reminder_rx) = tokio::sync::mpsc::unbounded_channel();
     let reminder_store = match reminders::Reminders::open(&paths::reminders_db()) {
         Ok(store) => Some(Arc::new(store)),