[Security] Unbound variable NameError on InfluxDB query failure

[dom-omg]

File: common/src/common/database/influxdb.py line 491

Code:
try:
query_results = api_queryfcast.query_data_frame(query)
except Exception as e:
logger.info("An error occurred while querying data: %s", e)

  if query_results.empty:  # ← NameError if exception was raised above                                   

Problem:
query_results is assigned inside the try block only. If the InfluxDB query
raises an exception, query_results is never defined. Execution continues to
query_results.empty and raises NameError — silently crashing the data API.

Fix:
Initialize before the try block:
query_results = None
try:
query_results = api_queryfcast.query_data_frame(query)
except Exception as e:
logger.info(...)
return {"error": "The InfluxDB query failed to execute."}

  if query_results is None or query_results.empty:                                                       

Same pattern as predictive-control issue #3 (grap_info unbound).
Found via AST analysis — COBALT formal verification engine.

Reported by: Dominik Blain — COBALT verification