{
  "keep": {
    "objective": "Migrate the nightly invoice export from CSV to Parquet without breaking the finance job.",
    "constraints": [
      "Must not change the export schedule.",
      "Finance reads files from the same bucket path."
    ],
    "decisions": [
      "Decided to use pyarrow for Parquet.",
      "Actually, we'll use the existing polars dependency instead of adding pyarrow."
    ],
    "currentState": [
      "The export timeout is 30 minutes.",
      "The export timeout is 45 minutes in staging.",
      "Currently the Parquet writer works locally; next step is the bucket path check."
    ],
    "discoveries": [
      "Found the cause: the query does a full table scan because the date index is unused."
    ]
  },
  "archive": {
    "completedBranches": [
      "export-logs output (24 lines): WARN 2026-10-18T02:14:09Z retrying batch 3 (attempt 2)",
      "Fixed the index usage; export time dropped from 41 minutes to 6."
    ],
    "previousAttempts": [
      "Tried streaming the CSV writer; still slow."
    ],
    "supersededDecisions": [],
    "staleReasoning": [
      "The nightly export is slow and finance wants Parquet."
    ]
  },
  "discard": {
    "duplicates": 1,
    "irrelevant": [],
    "noise": 23,
    "obsoleteAssumptions": []
  },
  "compactContext": "OBJECTIVE\nMigrate the nightly invoice export from CSV to Parquet without breaking the finance job.\n\nCONSTRAINTS\n- Must not change the export schedule.\n- Finance reads files from the same bucket path.\n\nDECISIONS\n- Decided to use pyarrow for Parquet.\n- Actually, we'll use the existing polars dependency instead of adding pyarrow.\n\nCURRENT STATE\n- The export timeout is 30 minutes.\n- The export timeout is 45 minutes in staging.\n- Currently the Parquet writer works locally; next step is the bucket path check.\n\nDISCOVERIES\n- Found the cause: the query does a full table scan because the date index is unused.\n\nCONTRADICTIONS TO RESOLVE\n- The export timeout is 30 minutes. ↔ The export timeout is 45 minutes in staging.\n\nVERIFY BEFORE RELYING ON\n- I think the CSV writer is the bottleneck.\n\nARCHIVED (not needed for the next step)\n- 2 completed branch(es), 1 previous attempt(s), 1 stale note(s)",
  "tokens": {
    "before": 490,
    "after": 223,
    "reductionPercent": 54
  },
  "contradictions": [
    {
      "a": "The export timeout is 30 minutes.",
      "b": "The export timeout is 45 minutes in staging.",
      "note": "Different values given for \"export timeout\"."
    }
  ],
  "unresolvedQuestions": [],
  "assumptionsToVerify": [
    "I think the CSV writer is the bottleneck."
  ]
}