organize the recent checks

app/models.py

@@ -137,27 +137,40 @@ def add_check(service_id: int, success: bool, response_time_ms: float | None, er
         )
 
 
-def get_checks(service_id: int, limit: int = 50, from_ts: str = None, to_ts: str = None, status_filter: str = None, search: str = None):
-    """Get recent checks for a service, optionally filtered by timestamp, status (ok/error), and error search."""
+def _checks_where_args(service_id: int, from_ts: str = None, to_ts: str = None, status_filter: str = None, search: str = None):
+    """Build WHERE clause and args for checks queries."""
+    q = "WHERE service_id = ?"
+    args = [service_id]
+    if from_ts:
+        q += " AND timestamp >= ?"
+        args.append(from_ts)
+    if to_ts:
+        q += " AND timestamp <= ?"
+        args.append(to_ts)
+    if status_filter == "error":
+        q += " AND status = 'ERROR'"
+    elif status_filter == "ok":
+        q += " AND status = 'OK'"
+    if search:
+        q += " AND (error_message LIKE ? OR status LIKE ?)"
+        args.extend([f"%{search}%", f"%{search}%"])
+    return q, args
+
+
+def get_checks_count(service_id: int, from_ts: str = None, to_ts: str = None, status_filter: str = None, search: str = None) -> int:
+    """Count checks matching filters (for pagination)."""
+    where, args = _checks_where_args(service_id, from_ts, to_ts, status_filter, search)
     with get_db() as conn:
-        q = "SELECT * FROM checks WHERE service_id = ?"
-        args = [service_id]
-        if from_ts:
-            q += " AND timestamp >= ?"
-            args.append(from_ts)
-        if to_ts:
-            q += " AND timestamp <= ?"
-            args.append(to_ts)
-        if status_filter == "error":
-            q += " AND status = 'ERROR'"
-        elif status_filter == "ok":
-            q += " AND status = 'OK'"
-        if search:
-            q += " AND (error_message LIKE ? OR status LIKE ?)"
-            args.extend([f"%{search}%", f"%{search}%"])
-        q += " ORDER BY timestamp DESC LIMIT ?"
-        args.append(limit)
-        rows = conn.execute(q, args).fetchall()
+        row = conn.execute(f"SELECT COUNT(*) FROM checks {where}", args).fetchone()
+        return row[0]
+
+
+def get_checks(service_id: int, limit: int = 50, offset: int = 0, from_ts: str = None, to_ts: str = None, status_filter: str = None, search: str = None):
+    """Get recent checks for a service, optionally filtered and paginated."""
+    where, args = _checks_where_args(service_id, from_ts, to_ts, status_filter, search)
+    args.extend([limit, offset])
+    with get_db() as conn:
+        rows = conn.execute(f"SELECT * FROM checks {where} ORDER BY timestamp DESC LIMIT ? OFFSET ?", args).fetchall()
         return [dict(r) for r in rows]