Improve agent UX and spec sync

backend/src/agent/langgraph_setup.py

@@ -192,7 +192,12 @@ async def create_agent(
         "You handle all intent detection — multi-intent queries, negations (\"don't run\"), "
         "synonyms (\"панели\" = \"дашборды\"), and typos are your responsibility. "
         "Call the right tool(s) for the job. If data is already provided in context, "
-        "use it directly rather than calling redundant tools."
+        "use it directly rather than calling redundant tools. "
+        "For maintenance requests, use the RUNTIME CONTEXT current datetime when the user says "
+        "\"start\", \"run\", \"now\", \"запусти\", or \"сейчас\" without an explicit start time. "
+        "Convert user durations into end_time. Do not ask for ISO datetime in that case. "
+        "If a user asks for dashboard maintenance, resolve the dashboard from provided context or tools, "
+        "then infer affected tables when possible; ask for table names only after resolution fails."
     )
     if env_id:
         prompt += f"\n\nCurrent environment: '{env_id}'. When calling tools that accept env_id, use this value."