FlexMeasures / flexmeasures / 24054410246

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main: 81%

Pull #1985

github

fix: add max-size (1000) and time-bucket key to sensor stats cache

- Include round(time.time() / 120) in the cache key so at most one DB hit
  per sensor per 120-second window is possible; this also caps the number
  of unique keys an attacker can create to 1 per sensor per bucket, limiting
  cache-exhaustion risk.
- Cap the dict at _SENSOR_STATS_MAX_SIZE=1000 entries; when full, the oldest
  entry (FIFO insertion order) is evicted before inserting a new one.
- Empty results are still never cached (freshly-uploaded data always visible).
- Removes the explicit (populated_at, result) tuple -- TTL is now implicit in
  the bucket component of the key, so only the result dict is stored.

Agent-Logs-Url: https://github.com/FlexMeasures/flexmeasures/sessions/7bbceb3b-247e-489d-b0d5-498be80cd12f

Co-authored-by: nhoening <1042336+nhoening@users.noreply.github.com>

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