fix(#937): narrow skip to same-body pending — different schedules can still enqueue

hive-c0re/src/broker.rs

@@ -278,6 +278,27 @@ impl Broker {
         Ok(n > 0)
     }
 
+    /// Returns true when the recipient already has at least one
+    /// undelivered message from `sender` with exactly `body` in the
+    /// broker. Used by the scheduler to skip re-delivery of the same
+    /// scheduled prompt without blocking distinct schedules whose
+    /// bodies differ.
+    pub fn has_pending_with_body(
+        &self,
+        recipient: &str,
+        sender: &str,
+        body: &str,
+    ) -> Result<bool> {
+        let conn = self.conn.lock().unwrap();
+        let n: i64 = conn.query_row(
+            "SELECT COUNT(*) FROM messages
+              WHERE recipient = ?1 AND sender = ?2 AND body = ?3 AND delivered_at IS NULL",
+            params![recipient, sender, body],
+            |row| row.get(0),
+        )?;
+        Ok(n > 0)
+    }
+
     /// Long-poll variant of `recv_batch`: returns immediately if any
     /// row is pending (popping up to `max`); otherwise waits up to
     /// `timeout` for the broker to emit a `Sent { to: recipient }`
@@ -1269,3 +1290,4 @@ mod tests {
         assert!(pop_one(broker, "bob").is_none());
     }
 }
+