{
  "format": "mysql-lab-run/v1",
  "recorded_at": "2026-11-13T12:17:55.647612+00:00",
  "provenance": "Executed against a real isolated MySQL server, not a simulation. Public fields are allowlisted; raw InnoDB text remains local.",
  "environment": {
    "version": "8.4.13",
    "arch": "aarch64",
    "buffer_pool_bytes": 134217728,
    "deadlock_detect": 1,
    "performance_schema": 1,
    "driver": "PyMySQL 1.1.2",
    "python": "3.11.2",
    "runtime": "Docker / Linux ARM64",
    "image": "mysql:8.4.13@sha256:a81d043930e51745522bd5c430961cf8286f0a23f0a9a2a6e0108f7ea71b0902",
    "mysql_memory_limit_mib": 1024,
    "mysql_cpu_limit": 2
  },
  "schema_sql": "CREATE TABLE a (id INT PRIMARY KEY, value INT NOT NULL) ENGINE=InnoDB;\nCREATE TABLE b (id INT PRIMARY KEY, value INT NOT NULL) ENGINE=InnoDB;\nCREATE TABLE events (id INT PRIMARY KEY, tenant_id INT NOT NULL, status VARCHAR(12) NOT NULL,\ncreated_at DATE NOT NULL, amount_cents INT NOT NULL, payload VARCHAR(128) NOT NULL) ENGINE=InnoDB;",
  "collector_sql": {
    "locks": "SELECT THREAD_ID, OBJECT_NAME, INDEX_NAME, LOCK_TYPE, LOCK_MODE, LOCK_STATUS, LOCK_DATA\nFROM performance_schema.data_locks WHERE OBJECT_SCHEMA='mysql_lab'\nORDER BY OBJECT_NAME, THREAD_ID, LOCK_TYPE, LOCK_STATUS",
    "waits": "SELECT r.THREAD_ID AS waiting_thread, b.THREAD_ID AS blocking_thread,\nr.OBJECT_NAME AS table_name, r.INDEX_NAME AS index_name, r.LOCK_MODE AS requested_mode,\nb.LOCK_MODE AS held_mode, r.LOCK_DATA AS lock_data\nFROM performance_schema.data_lock_waits w\nJOIN performance_schema.data_locks r ON r.ENGINE_LOCK_ID=w.REQUESTING_ENGINE_LOCK_ID\nJOIN performance_schema.data_locks b ON b.ENGINE_LOCK_ID=w.BLOCKING_ENGINE_LOCK_ID\nWHERE r.OBJECT_SCHEMA='mysql_lab' ORDER BY table_name, waiting_thread"
  },
  "deadlock": {
    "outcomes": {
      "B": {
        "status": "rolled_back",
        "errno": 1213
      },
      "A": {
        "status": "committed"
      }
    },
    "snapshot_before_cycle": {
      "source": [
        "performance_schema.data_locks",
        "performance_schema.data_lock_waits"
      ],
      "locks": [
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": "1",
          "actor": "A"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "A"
        },
        {
          "OBJECT_NAME": "b",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "WAITING",
          "LOCK_DATA": "1",
          "actor": "A"
        },
        {
          "OBJECT_NAME": "b",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "A"
        },
        {
          "OBJECT_NAME": "b",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": "1",
          "actor": "B"
        },
        {
          "OBJECT_NAME": "b",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "B"
        }
      ],
      "waits": [
        {
          "table_name": "b",
          "index_name": "PRIMARY",
          "requested_mode": "X,REC_NOT_GAP",
          "held_mode": "X,REC_NOT_GAP",
          "lock_data": "1",
          "waiting_actor": "A",
          "blocking_actor": "B"
        }
      ]
    },
    "deadlock_excerpt": [
      "*** (1) TRANSACTION:",
      "UPDATE b SET value=value+1 WHERE id=1",
      "*** (1) HOLDS THE LOCK(S):",
      "RECORD LOCKS space id 2 page no 4 n bits 72 index PRIMARY of table `mysql_lab`.`a` trx id 1828 lock_mode X locks rec but not gap",
      "*** (1) WAITING FOR THIS LOCK TO BE GRANTED:",
      "RECORD LOCKS space id 3 page no 4 n bits 72 index PRIMARY of table `mysql_lab`.`b` trx id 1828 lock_mode X locks rec but not gap waiting",
      "*** (2) TRANSACTION:",
      "UPDATE a SET value=value+1 WHERE id=1",
      "*** (2) HOLDS THE LOCK(S):",
      "RECORD LOCKS space id 3 page no 4 n bits 72 index PRIMARY of table `mysql_lab`.`b` trx id 1831 lock_mode X locks rec but not gap",
      "*** (2) WAITING FOR THIS LOCK TO BE GRANTED:",
      "RECORD LOCKS space id 2 page no 4 n bits 72 index PRIMARY of table `mysql_lab`.`a` trx id 1831 lock_mode X locks rec but not gap waiting",
      "*** WE ROLL BACK TRANSACTION (2)"
    ],
    "final_values": {
      "a": 101,
      "b": 101
    },
    "timeline": [
      {
        "step": 1,
        "elapsed_ms": 7.985,
        "actor": "A",
        "action": "submit",
        "sql": "START TRANSACTION"
      },
      {
        "step": 2,
        "elapsed_ms": 8.569,
        "actor": "A",
        "action": "returned",
        "sql": "START TRANSACTION",
        "rows": []
      },
      {
        "step": 3,
        "elapsed_ms": 8.572,
        "actor": "A",
        "action": "submit",
        "sql": "UPDATE a SET value=value+1 WHERE id=1"
      },
      {
        "step": 4,
        "elapsed_ms": 9.133,
        "actor": "A",
        "action": "returned",
        "sql": "UPDATE a SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 5,
        "elapsed_ms": 9.137,
        "actor": "B",
        "action": "submit",
        "sql": "START TRANSACTION"
      },
      {
        "step": 6,
        "elapsed_ms": 9.501,
        "actor": "B",
        "action": "returned",
        "sql": "START TRANSACTION",
        "rows": []
      },
      {
        "step": 7,
        "elapsed_ms": 9.504,
        "actor": "B",
        "action": "submit",
        "sql": "UPDATE b SET value=value+1 WHERE id=1"
      },
      {
        "step": 8,
        "elapsed_ms": 10.06,
        "actor": "B",
        "action": "returned",
        "sql": "UPDATE b SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 9,
        "elapsed_ms": 10.063,
        "actor": "coordinator",
        "action": "barrier: both first updates completed"
      },
      {
        "step": 10,
        "elapsed_ms": 10.16,
        "actor": "A",
        "action": "submit",
        "sql": "UPDATE b SET value=value+1 WHERE id=1"
      },
      {
        "step": 11,
        "elapsed_ms": 14.822,
        "actor": "observer",
        "action": "barrier: observed lock wait",
        "waiting": "A",
        "blocking": "B"
      },
      {
        "step": 12,
        "elapsed_ms": 14.827,
        "actor": "coordinator",
        "action": "barrier: close cycle only after observed A→B wait"
      },
      {
        "step": 13,
        "elapsed_ms": 14.828,
        "actor": "B",
        "action": "submit",
        "sql": "UPDATE a SET value=value+1 WHERE id=1"
      },
      {
        "step": 14,
        "elapsed_ms": 15.74,
        "actor": "A",
        "action": "returned",
        "sql": "UPDATE b SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 15,
        "elapsed_ms": 15.745,
        "actor": "A",
        "action": "submit",
        "sql": "COMMIT"
      },
      {
        "step": 16,
        "elapsed_ms": 16.012,
        "actor": "B",
        "action": "mysql_error",
        "sql": "UPDATE a SET value=value+1 WHERE id=1",
        "errno": 1213
      },
      {
        "step": 17,
        "elapsed_ms": 16.019,
        "actor": "B",
        "action": "submit",
        "sql": "ROLLBACK"
      },
      {
        "step": 18,
        "elapsed_ms": 16.701,
        "actor": "B",
        "action": "returned",
        "sql": "ROLLBACK",
        "rows": []
      },
      {
        "step": 19,
        "elapsed_ms": 17.4,
        "actor": "A",
        "action": "returned",
        "sql": "COMMIT",
        "rows": []
      }
    ],
    "assertions_passed": true
  },
  "ordered_control": {
    "outcomes": {
      "A": "committed",
      "B": "committed"
    },
    "snapshot": {
      "source": [
        "performance_schema.data_locks",
        "performance_schema.data_lock_waits"
      ],
      "locks": [
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": "1",
          "actor": "A"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "A"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "WAITING",
          "LOCK_DATA": "1",
          "actor": "B"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "B"
        }
      ],
      "waits": [
        {
          "table_name": "a",
          "index_name": "PRIMARY",
          "requested_mode": "X,REC_NOT_GAP",
          "held_mode": "X,REC_NOT_GAP",
          "lock_data": "1",
          "waiting_actor": "B",
          "blocking_actor": "A"
        }
      ]
    },
    "final_values": {
      "a": 102,
      "b": 102
    },
    "timeline": [
      {
        "step": 1,
        "elapsed_ms": 6.026,
        "actor": "A",
        "action": "submit",
        "sql": "START TRANSACTION"
      },
      {
        "step": 2,
        "elapsed_ms": 6.522,
        "actor": "A",
        "action": "returned",
        "sql": "START TRANSACTION",
        "rows": []
      },
      {
        "step": 3,
        "elapsed_ms": 6.527,
        "actor": "A",
        "action": "submit",
        "sql": "UPDATE a SET value=value+1 WHERE id=1"
      },
      {
        "step": 4,
        "elapsed_ms": 7.057,
        "actor": "A",
        "action": "returned",
        "sql": "UPDATE a SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 5,
        "elapsed_ms": 7.061,
        "actor": "B",
        "action": "submit",
        "sql": "START TRANSACTION"
      },
      {
        "step": 6,
        "elapsed_ms": 7.398,
        "actor": "B",
        "action": "returned",
        "sql": "START TRANSACTION",
        "rows": []
      },
      {
        "step": 7,
        "elapsed_ms": 7.487,
        "actor": "B",
        "action": "submit",
        "sql": "UPDATE a SET value=value+1 WHERE id=1"
      },
      {
        "step": 8,
        "elapsed_ms": 9.282,
        "actor": "observer",
        "action": "barrier: observed lock wait",
        "waiting": "B",
        "blocking": "A"
      },
      {
        "step": 9,
        "elapsed_ms": 9.288,
        "actor": "A",
        "action": "submit",
        "sql": "UPDATE b SET value=value+1 WHERE id=1"
      },
      {
        "step": 10,
        "elapsed_ms": 9.746,
        "actor": "A",
        "action": "returned",
        "sql": "UPDATE b SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 11,
        "elapsed_ms": 9.749,
        "actor": "A",
        "action": "submit",
        "sql": "COMMIT"
      },
      {
        "step": 12,
        "elapsed_ms": 11.295,
        "actor": "A",
        "action": "returned",
        "sql": "COMMIT",
        "rows": []
      },
      {
        "step": 13,
        "elapsed_ms": 11.499,
        "actor": "B",
        "action": "returned",
        "sql": "UPDATE a SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 14,
        "elapsed_ms": 11.508,
        "actor": "B",
        "action": "submit",
        "sql": "UPDATE b SET value=value+1 WHERE id=1"
      },
      {
        "step": 15,
        "elapsed_ms": 12.06,
        "actor": "B",
        "action": "returned",
        "sql": "UPDATE b SET value=value+1 WHERE id=1",
        "rows": []
      },
      {
        "step": 16,
        "elapsed_ms": 12.062,
        "actor": "B",
        "action": "submit",
        "sql": "COMMIT"
      },
      {
        "step": 17,
        "elapsed_ms": 13.133,
        "actor": "B",
        "action": "returned",
        "sql": "COMMIT",
        "rows": []
      }
    ],
    "assertions_passed": true
  },
  "isolation": [
    {
      "level": "READ COMMITTED",
      "ordinary_first": 100,
      "ordinary_after_B_commit": 200,
      "locking_read": 200,
      "ordinary_after_locking_read": 200,
      "final_after_release": 300,
      "writer_wait_snapshot": {
        "source": [
          "performance_schema.data_locks",
          "performance_schema.data_lock_waits"
        ],
        "locks": [
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": "PRIMARY",
            "LOCK_TYPE": "RECORD",
            "LOCK_MODE": "X,REC_NOT_GAP",
            "LOCK_STATUS": "GRANTED",
            "LOCK_DATA": "1",
            "actor": "A"
          },
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": null,
            "LOCK_TYPE": "TABLE",
            "LOCK_MODE": "IX",
            "LOCK_STATUS": "GRANTED",
            "LOCK_DATA": null,
            "actor": "A"
          },
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": "PRIMARY",
            "LOCK_TYPE": "RECORD",
            "LOCK_MODE": "X,REC_NOT_GAP",
            "LOCK_STATUS": "WAITING",
            "LOCK_DATA": "1",
            "actor": "B"
          },
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": null,
            "LOCK_TYPE": "TABLE",
            "LOCK_MODE": "IX",
            "LOCK_STATUS": "GRANTED",
            "LOCK_DATA": null,
            "actor": "B"
          }
        ],
        "waits": [
          {
            "table_name": "a",
            "index_name": "PRIMARY",
            "requested_mode": "X,REC_NOT_GAP",
            "held_mode": "X,REC_NOT_GAP",
            "lock_data": "1",
            "waiting_actor": "B",
            "blocking_actor": "A"
          }
        ]
      },
      "timeline": [
        {
          "step": 1,
          "elapsed_ms": 6.601,
          "actor": "A",
          "action": "submit",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED"
        },
        {
          "step": 2,
          "elapsed_ms": 6.956,
          "actor": "A",
          "action": "returned",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED",
          "rows": []
        },
        {
          "step": 3,
          "elapsed_ms": 6.959,
          "actor": "B",
          "action": "submit",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED"
        },
        {
          "step": 4,
          "elapsed_ms": 7.263,
          "actor": "B",
          "action": "returned",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED",
          "rows": []
        },
        {
          "step": 5,
          "elapsed_ms": 7.265,
          "actor": "A",
          "action": "submit",
          "sql": "START TRANSACTION"
        },
        {
          "step": 6,
          "elapsed_ms": 7.577,
          "actor": "A",
          "action": "returned",
          "sql": "START TRANSACTION",
          "rows": []
        },
        {
          "step": 7,
          "elapsed_ms": 7.579,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1"
        },
        {
          "step": 8,
          "elapsed_ms": 7.977,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1",
          "rows": [
            {
              "value": 100
            }
          ]
        },
        {
          "step": 9,
          "elapsed_ms": 7.979,
          "actor": "B",
          "action": "submit",
          "sql": "START TRANSACTION"
        },
        {
          "step": 10,
          "elapsed_ms": 8.316,
          "actor": "B",
          "action": "returned",
          "sql": "START TRANSACTION",
          "rows": []
        },
        {
          "step": 11,
          "elapsed_ms": 8.318,
          "actor": "B",
          "action": "submit",
          "sql": "UPDATE a SET value=200 WHERE id=1"
        },
        {
          "step": 12,
          "elapsed_ms": 8.758,
          "actor": "B",
          "action": "returned",
          "sql": "UPDATE a SET value=200 WHERE id=1",
          "rows": []
        },
        {
          "step": 13,
          "elapsed_ms": 8.76,
          "actor": "B",
          "action": "submit",
          "sql": "COMMIT"
        },
        {
          "step": 14,
          "elapsed_ms": 9.823,
          "actor": "B",
          "action": "returned",
          "sql": "COMMIT",
          "rows": []
        },
        {
          "step": 15,
          "elapsed_ms": 9.825,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1"
        },
        {
          "step": 16,
          "elapsed_ms": 10.266,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1",
          "rows": [
            {
              "value": 200
            }
          ]
        },
        {
          "step": 17,
          "elapsed_ms": 10.273,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1 FOR UPDATE"
        },
        {
          "step": 18,
          "elapsed_ms": 10.883,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1 FOR UPDATE",
          "rows": [
            {
              "value": 200
            }
          ]
        },
        {
          "step": 19,
          "elapsed_ms": 10.888,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1"
        },
        {
          "step": 20,
          "elapsed_ms": 11.41,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1",
          "rows": [
            {
              "value": 200
            }
          ]
        },
        {
          "step": 21,
          "elapsed_ms": 11.501,
          "actor": "B",
          "action": "submit",
          "sql": "START TRANSACTION"
        },
        {
          "step": 22,
          "elapsed_ms": 12.033,
          "actor": "B",
          "action": "returned",
          "sql": "START TRANSACTION",
          "rows": []
        },
        {
          "step": 23,
          "elapsed_ms": 12.037,
          "actor": "B",
          "action": "submit",
          "sql": "UPDATE a SET value=300 WHERE id=1"
        },
        {
          "step": 24,
          "elapsed_ms": 40.119,
          "actor": "observer",
          "action": "barrier: observed lock wait",
          "waiting": "B",
          "blocking": "A"
        },
        {
          "step": 25,
          "elapsed_ms": 40.126,
          "actor": "A",
          "action": "submit",
          "sql": "COMMIT"
        },
        {
          "step": 26,
          "elapsed_ms": 40.668,
          "actor": "A",
          "action": "returned",
          "sql": "COMMIT",
          "rows": []
        },
        {
          "step": 27,
          "elapsed_ms": 40.698,
          "actor": "B",
          "action": "returned",
          "sql": "UPDATE a SET value=300 WHERE id=1",
          "rows": []
        },
        {
          "step": 28,
          "elapsed_ms": 40.7,
          "actor": "B",
          "action": "submit",
          "sql": "COMMIT"
        },
        {
          "step": 29,
          "elapsed_ms": 42.106,
          "actor": "B",
          "action": "returned",
          "sql": "COMMIT",
          "rows": []
        }
      ],
      "assertions_passed": true
    },
    {
      "level": "REPEATABLE READ",
      "ordinary_first": 100,
      "ordinary_after_B_commit": 100,
      "locking_read": 200,
      "ordinary_after_locking_read": 100,
      "final_after_release": 300,
      "writer_wait_snapshot": {
        "source": [
          "performance_schema.data_locks",
          "performance_schema.data_lock_waits"
        ],
        "locks": [
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": "PRIMARY",
            "LOCK_TYPE": "RECORD",
            "LOCK_MODE": "X,REC_NOT_GAP",
            "LOCK_STATUS": "GRANTED",
            "LOCK_DATA": "1",
            "actor": "A"
          },
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": null,
            "LOCK_TYPE": "TABLE",
            "LOCK_MODE": "IX",
            "LOCK_STATUS": "GRANTED",
            "LOCK_DATA": null,
            "actor": "A"
          },
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": "PRIMARY",
            "LOCK_TYPE": "RECORD",
            "LOCK_MODE": "X,REC_NOT_GAP",
            "LOCK_STATUS": "WAITING",
            "LOCK_DATA": "1",
            "actor": "B"
          },
          {
            "OBJECT_NAME": "a",
            "INDEX_NAME": null,
            "LOCK_TYPE": "TABLE",
            "LOCK_MODE": "IX",
            "LOCK_STATUS": "GRANTED",
            "LOCK_DATA": null,
            "actor": "B"
          }
        ],
        "waits": [
          {
            "table_name": "a",
            "index_name": "PRIMARY",
            "requested_mode": "X,REC_NOT_GAP",
            "held_mode": "X,REC_NOT_GAP",
            "lock_data": "1",
            "waiting_actor": "B",
            "blocking_actor": "A"
          }
        ]
      },
      "timeline": [
        {
          "step": 1,
          "elapsed_ms": 5.42,
          "actor": "A",
          "action": "submit",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ"
        },
        {
          "step": 2,
          "elapsed_ms": 5.767,
          "actor": "A",
          "action": "returned",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ",
          "rows": []
        },
        {
          "step": 3,
          "elapsed_ms": 5.771,
          "actor": "B",
          "action": "submit",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ"
        },
        {
          "step": 4,
          "elapsed_ms": 6.099,
          "actor": "B",
          "action": "returned",
          "sql": "SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ",
          "rows": []
        },
        {
          "step": 5,
          "elapsed_ms": 6.101,
          "actor": "A",
          "action": "submit",
          "sql": "START TRANSACTION"
        },
        {
          "step": 6,
          "elapsed_ms": 6.423,
          "actor": "A",
          "action": "returned",
          "sql": "START TRANSACTION",
          "rows": []
        },
        {
          "step": 7,
          "elapsed_ms": 6.425,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1"
        },
        {
          "step": 8,
          "elapsed_ms": 6.948,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1",
          "rows": [
            {
              "value": 100
            }
          ]
        },
        {
          "step": 9,
          "elapsed_ms": 6.952,
          "actor": "B",
          "action": "submit",
          "sql": "START TRANSACTION"
        },
        {
          "step": 10,
          "elapsed_ms": 7.4,
          "actor": "B",
          "action": "returned",
          "sql": "START TRANSACTION",
          "rows": []
        },
        {
          "step": 11,
          "elapsed_ms": 7.402,
          "actor": "B",
          "action": "submit",
          "sql": "UPDATE a SET value=200 WHERE id=1"
        },
        {
          "step": 12,
          "elapsed_ms": 7.948,
          "actor": "B",
          "action": "returned",
          "sql": "UPDATE a SET value=200 WHERE id=1",
          "rows": []
        },
        {
          "step": 13,
          "elapsed_ms": 7.95,
          "actor": "B",
          "action": "submit",
          "sql": "COMMIT"
        },
        {
          "step": 14,
          "elapsed_ms": 9.077,
          "actor": "B",
          "action": "returned",
          "sql": "COMMIT",
          "rows": []
        },
        {
          "step": 15,
          "elapsed_ms": 9.081,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1"
        },
        {
          "step": 16,
          "elapsed_ms": 9.644,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1",
          "rows": [
            {
              "value": 100
            }
          ]
        },
        {
          "step": 17,
          "elapsed_ms": 9.648,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1 FOR UPDATE"
        },
        {
          "step": 18,
          "elapsed_ms": 10.072,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1 FOR UPDATE",
          "rows": [
            {
              "value": 200
            }
          ]
        },
        {
          "step": 19,
          "elapsed_ms": 10.075,
          "actor": "A",
          "action": "submit",
          "sql": "SELECT value FROM a WHERE id=1"
        },
        {
          "step": 20,
          "elapsed_ms": 10.557,
          "actor": "A",
          "action": "returned",
          "sql": "SELECT value FROM a WHERE id=1",
          "rows": [
            {
              "value": 100
            }
          ]
        },
        {
          "step": 21,
          "elapsed_ms": 10.671,
          "actor": "B",
          "action": "submit",
          "sql": "START TRANSACTION"
        },
        {
          "step": 22,
          "elapsed_ms": 11.173,
          "actor": "B",
          "action": "returned",
          "sql": "START TRANSACTION",
          "rows": []
        },
        {
          "step": 23,
          "elapsed_ms": 11.175,
          "actor": "B",
          "action": "submit",
          "sql": "UPDATE a SET value=300 WHERE id=1"
        },
        {
          "step": 24,
          "elapsed_ms": 39.647,
          "actor": "observer",
          "action": "barrier: observed lock wait",
          "waiting": "B",
          "blocking": "A"
        },
        {
          "step": 25,
          "elapsed_ms": 39.654,
          "actor": "A",
          "action": "submit",
          "sql": "COMMIT"
        },
        {
          "step": 26,
          "elapsed_ms": 40.146,
          "actor": "A",
          "action": "returned",
          "sql": "COMMIT",
          "rows": []
        },
        {
          "step": 27,
          "elapsed_ms": 40.268,
          "actor": "B",
          "action": "returned",
          "sql": "UPDATE a SET value=300 WHERE id=1",
          "rows": []
        },
        {
          "step": 28,
          "elapsed_ms": 40.275,
          "actor": "B",
          "action": "submit",
          "sql": "COMMIT"
        },
        {
          "step": 29,
          "elapsed_ms": 42.267,
          "actor": "B",
          "action": "returned",
          "sql": "COMMIT",
          "rows": []
        }
      ],
      "assertions_passed": true
    }
  ],
  "errors": {
    "syntax_error": 1064,
    "lock_wait_timeout": 1205,
    "connection_failure": 2003,
    "timeout_snapshot": {
      "source": [
        "performance_schema.data_locks",
        "performance_schema.data_lock_waits"
      ],
      "locks": [
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": "1",
          "actor": "A"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "A"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": "PRIMARY",
          "LOCK_TYPE": "RECORD",
          "LOCK_MODE": "X,REC_NOT_GAP",
          "LOCK_STATUS": "WAITING",
          "LOCK_DATA": "1",
          "actor": "B"
        },
        {
          "OBJECT_NAME": "a",
          "INDEX_NAME": null,
          "LOCK_TYPE": "TABLE",
          "LOCK_MODE": "IX",
          "LOCK_STATUS": "GRANTED",
          "LOCK_DATA": null,
          "actor": "B"
        }
      ],
      "waits": [
        {
          "table_name": "a",
          "index_name": "PRIMARY",
          "requested_mode": "X,REC_NOT_GAP",
          "held_mode": "X,REC_NOT_GAP",
          "lock_data": "1",
          "waiting_actor": "B",
          "blocking_actor": "A"
        }
      ]
    },
    "cleanup": "explicit rollback and all worker sessions closed",
    "assertions_passed": true
  },
  "indexes": {
    "seed": 20261113,
    "row_count": 60000,
    "dataset_sha256": "5230c270a21b616b1faed1070969386069ce34ac8bd001fe8af98edf665fe824",
    "status_distribution": [
      {
        "status": "cancelled",
        "n": 6049
      },
      {
        "status": "new",
        "n": 11984
      },
      {
        "status": "paid",
        "n": 41967
      }
    ],
    "tenant_7_paid_rows": 608,
    "index_ddl": "CREATE INDEX idx_tenant_status_date ON events(tenant_id,status,created_at)",
    "cache_condition": "Warm process/buffer pool; one untimed execution per variant; no cache flush; sequential fixed variant order. Host client fetch included in seven wall-clock samples; EXPLAIN ANALYZE is a separate server execution.",
    "warmups": 1,
    "repeats": 7,
    "variants": [
      {
        "id": "full_scan",
        "sql": "SELECT id,created_at,amount_cents FROM events WHERE tenant_id=7 AND status='paid' AND created_at>='2026-10-01' AND created_at<'2026-11-01' ORDER BY created_at,id",
        "explain_json": {
          "query_block": {
            "select_id": 1,
            "cost_info": {
              "query_cost": "6164.88"
            },
            "ordering_operation": {
              "using_filesort": true,
              "cost_info": {
                "sort_cost": "66.24"
              },
              "table": {
                "table_name": "events",
                "access_type": "ALL",
                "rows_examined_per_scan": 59624,
                "rows_produced_per_join": 66,
                "filtered": "0.11",
                "cost_info": {
                  "read_cost": "6092.03",
                  "eval_cost": "6.62",
                  "prefix_cost": "6098.65",
                  "data_read_per_join": "37K"
                },
                "used_columns": [
                  "id",
                  "tenant_id",
                  "status",
                  "created_at",
                  "amount_cents"
                ],
                "attached_condition": "((`mysql_lab`.`events`.`status` = 'paid') and (`mysql_lab`.`events`.`tenant_id` = 7) and (`mysql_lab`.`events`.`created_at` >= DATE'2026-10-01') and (`mysql_lab`.`events`.`created_at` < DATE'2026-11-01'))"
              }
            }
          }
        },
        "explain_analyze": "-> Sort: `events`.created_at, `events`.id  (cost=6099 rows=59624) (actual time=15.9..15.9 rows=55 loops=1)\n    -> Filter: ((`events`.`status` = 'paid') and (`events`.tenant_id = 7) and (`events`.created_at >= DATE'2026-10-01') and (`events`.created_at < DATE'2026-11-01'))  (cost=6099 rows=59624) (actual time=0.24..15.8 rows=55 loops=1)\n        -> Table scan on events  (cost=6099 rows=59624) (actual time=0.212..10.6 rows=60000 loops=1)\n",
        "timings_ms": [
          15.091,
          15.352,
          15.615,
          14.978,
          15.407,
          16.396,
          16.409
        ],
        "distribution_ms": {
          "min": 14.978,
          "median": 15.407,
          "p95_nearest_rank": 16.409,
          "max": 16.409
        },
        "result_rows": 55,
        "result_sha256": "145956ec1216f807cb1612395511175b3479549f323ca30d4a1e82a1c91f057b",
        "rows": [
          {
            "id": 32268,
            "created_at": "2026-10-02",
            "amount_cents": 62794
          },
          {
            "id": 34452,
            "created_at": "2026-10-02",
            "amount_cents": 13142
          },
          {
            "id": 48530,
            "created_at": "2026-10-03",
            "amount_cents": 8789
          },
          {
            "id": 52649,
            "created_at": "2026-10-03",
            "amount_cents": 36250
          },
          {
            "id": 16722,
            "created_at": "2026-10-04",
            "amount_cents": 23861
          },
          {
            "id": 51382,
            "created_at": "2026-10-05",
            "amount_cents": 39752
          },
          {
            "id": 22407,
            "created_at": "2026-10-06",
            "amount_cents": 21978
          },
          {
            "id": 40969,
            "created_at": "2026-10-06",
            "amount_cents": 72828
          },
          {
            "id": 19171,
            "created_at": "2026-10-08",
            "amount_cents": 39927
          },
          {
            "id": 57425,
            "created_at": "2026-10-08",
            "amount_cents": 17278
          },
          {
            "id": 23847,
            "created_at": "2026-10-09",
            "amount_cents": 52268
          },
          {
            "id": 29652,
            "created_at": "2026-10-10",
            "amount_cents": 20804
          },
          {
            "id": 17720,
            "created_at": "2026-10-11",
            "amount_cents": 69919
          },
          {
            "id": 3478,
            "created_at": "2026-10-12",
            "amount_cents": 69533
          },
          {
            "id": 21702,
            "created_at": "2026-10-12",
            "amount_cents": 17322
          },
          {
            "id": 24711,
            "created_at": "2026-10-12",
            "amount_cents": 80004
          },
          {
            "id": 46281,
            "created_at": "2026-10-13",
            "amount_cents": 3983
          },
          {
            "id": 700,
            "created_at": "2026-10-15",
            "amount_cents": 77941
          },
          {
            "id": 48356,
            "created_at": "2026-10-15",
            "amount_cents": 69247
          },
          {
            "id": 57077,
            "created_at": "2026-10-16",
            "amount_cents": 49996
          },
          {
            "id": 4127,
            "created_at": "2026-10-17",
            "amount_cents": 98423
          },
          {
            "id": 32752,
            "created_at": "2026-10-17",
            "amount_cents": 40638
          },
          {
            "id": 14959,
            "created_at": "2026-10-18",
            "amount_cents": 28238
          },
          {
            "id": 53976,
            "created_at": "2026-10-18",
            "amount_cents": 19207
          },
          {
            "id": 4600,
            "created_at": "2026-10-19",
            "amount_cents": 4839
          },
          {
            "id": 10950,
            "created_at": "2026-10-19",
            "amount_cents": 32883
          },
          {
            "id": 43845,
            "created_at": "2026-10-19",
            "amount_cents": 82655
          },
          {
            "id": 13847,
            "created_at": "2026-10-20",
            "amount_cents": 23738
          },
          {
            "id": 14192,
            "created_at": "2026-10-20",
            "amount_cents": 47278
          },
          {
            "id": 17371,
            "created_at": "2026-10-20",
            "amount_cents": 45353
          },
          {
            "id": 27104,
            "created_at": "2026-10-20",
            "amount_cents": 94365
          },
          {
            "id": 54372,
            "created_at": "2026-10-20",
            "amount_cents": 92325
          },
          {
            "id": 5601,
            "created_at": "2026-10-21",
            "amount_cents": 93479
          },
          {
            "id": 10856,
            "created_at": "2026-10-21",
            "amount_cents": 69502
          },
          {
            "id": 39296,
            "created_at": "2026-10-21",
            "amount_cents": 89953
          },
          {
            "id": 109,
            "created_at": "2026-10-22",
            "amount_cents": 10254
          },
          {
            "id": 1140,
            "created_at": "2026-10-22",
            "amount_cents": 83529
          },
          {
            "id": 34350,
            "created_at": "2026-10-22",
            "amount_cents": 68809
          },
          {
            "id": 36368,
            "created_at": "2026-10-22",
            "amount_cents": 16834
          },
          {
            "id": 52664,
            "created_at": "2026-10-22",
            "amount_cents": 37877
          },
          {
            "id": 10843,
            "created_at": "2026-10-23",
            "amount_cents": 9121
          },
          {
            "id": 39357,
            "created_at": "2026-10-23",
            "amount_cents": 51123
          },
          {
            "id": 2704,
            "created_at": "2026-10-24",
            "amount_cents": 52699
          },
          {
            "id": 9410,
            "created_at": "2026-10-24",
            "amount_cents": 87433
          },
          {
            "id": 48438,
            "created_at": "2026-10-24",
            "amount_cents": 84379
          },
          {
            "id": 1287,
            "created_at": "2026-10-25",
            "amount_cents": 65700
          },
          {
            "id": 32048,
            "created_at": "2026-10-25",
            "amount_cents": 49619
          },
          {
            "id": 27847,
            "created_at": "2026-10-26",
            "amount_cents": 66022
          },
          {
            "id": 44542,
            "created_at": "2026-10-26",
            "amount_cents": 13959
          },
          {
            "id": 32275,
            "created_at": "2026-10-27",
            "amount_cents": 41203
          },
          {
            "id": 3723,
            "created_at": "2026-10-28",
            "amount_cents": 59128
          },
          {
            "id": 24768,
            "created_at": "2026-10-28",
            "amount_cents": 31129
          },
          {
            "id": 45032,
            "created_at": "2026-10-28",
            "amount_cents": 1683
          },
          {
            "id": 11650,
            "created_at": "2026-10-30",
            "amount_cents": 32703
          },
          {
            "id": 46823,
            "created_at": "2026-10-31",
            "amount_cents": 33090
          }
        ]
      },
      {
        "id": "composite_noncover",
        "sql": "SELECT id,created_at,amount_cents FROM events WHERE tenant_id=7 AND status='paid' AND created_at>='2026-10-01' AND created_at<'2026-11-01' ORDER BY created_at,id",
        "explain_json": {
          "query_block": {
            "select_id": 1,
            "cost_info": {
              "query_cost": "25.01"
            },
            "ordering_operation": {
              "using_filesort": false,
              "table": {
                "table_name": "events",
                "access_type": "range",
                "possible_keys": [
                  "idx_tenant_status_date"
                ],
                "key": "idx_tenant_status_date",
                "used_key_parts": [
                  "tenant_id",
                  "status",
                  "created_at"
                ],
                "key_length": "57",
                "rows_examined_per_scan": 55,
                "rows_produced_per_join": 55,
                "filtered": "100.00",
                "index_condition": "((`mysql_lab`.`events`.`status` = 'paid') and (`mysql_lab`.`events`.`tenant_id` = 7) and (`mysql_lab`.`events`.`created_at` >= DATE'2026-10-01') and (`mysql_lab`.`events`.`created_at` < DATE'2026-11-01'))",
                "cost_info": {
                  "read_cost": "19.51",
                  "eval_cost": "5.50",
                  "prefix_cost": "25.01",
                  "data_read_per_join": "31K"
                },
                "used_columns": [
                  "id",
                  "tenant_id",
                  "status",
                  "created_at",
                  "amount_cents"
                ]
              }
            }
          }
        },
        "explain_analyze": "-> Index range scan on events using idx_tenant_status_date over (tenant_id = 7 AND status = 'paid' AND '2026-10-01' <= created_at < '2026-11-01'), with index condition: ((`events`.`status` = 'paid') and (`events`.tenant_id = 7) and (`events`.created_at >= DATE'2026-10-01') and (`events`.created_at < DATE'2026-11-01'))  (cost=25 rows=55) (actual time=0.0747..0.0801 rows=55 loops=1)\n",
        "timings_ms": [
          0.774,
          0.742,
          1.018,
          1.11,
          0.906,
          0.917,
          1.035
        ],
        "distribution_ms": {
          "min": 0.742,
          "median": 0.917,
          "p95_nearest_rank": 1.11,
          "max": 1.11
        },
        "result_rows": 55,
        "result_sha256": "145956ec1216f807cb1612395511175b3479549f323ca30d4a1e82a1c91f057b",
        "rows": [
          {
            "id": 32268,
            "created_at": "2026-10-02",
            "amount_cents": 62794
          },
          {
            "id": 34452,
            "created_at": "2026-10-02",
            "amount_cents": 13142
          },
          {
            "id": 48530,
            "created_at": "2026-10-03",
            "amount_cents": 8789
          },
          {
            "id": 52649,
            "created_at": "2026-10-03",
            "amount_cents": 36250
          },
          {
            "id": 16722,
            "created_at": "2026-10-04",
            "amount_cents": 23861
          },
          {
            "id": 51382,
            "created_at": "2026-10-05",
            "amount_cents": 39752
          },
          {
            "id": 22407,
            "created_at": "2026-10-06",
            "amount_cents": 21978
          },
          {
            "id": 40969,
            "created_at": "2026-10-06",
            "amount_cents": 72828
          },
          {
            "id": 19171,
            "created_at": "2026-10-08",
            "amount_cents": 39927
          },
          {
            "id": 57425,
            "created_at": "2026-10-08",
            "amount_cents": 17278
          },
          {
            "id": 23847,
            "created_at": "2026-10-09",
            "amount_cents": 52268
          },
          {
            "id": 29652,
            "created_at": "2026-10-10",
            "amount_cents": 20804
          },
          {
            "id": 17720,
            "created_at": "2026-10-11",
            "amount_cents": 69919
          },
          {
            "id": 3478,
            "created_at": "2026-10-12",
            "amount_cents": 69533
          },
          {
            "id": 21702,
            "created_at": "2026-10-12",
            "amount_cents": 17322
          },
          {
            "id": 24711,
            "created_at": "2026-10-12",
            "amount_cents": 80004
          },
          {
            "id": 46281,
            "created_at": "2026-10-13",
            "amount_cents": 3983
          },
          {
            "id": 700,
            "created_at": "2026-10-15",
            "amount_cents": 77941
          },
          {
            "id": 48356,
            "created_at": "2026-10-15",
            "amount_cents": 69247
          },
          {
            "id": 57077,
            "created_at": "2026-10-16",
            "amount_cents": 49996
          },
          {
            "id": 4127,
            "created_at": "2026-10-17",
            "amount_cents": 98423
          },
          {
            "id": 32752,
            "created_at": "2026-10-17",
            "amount_cents": 40638
          },
          {
            "id": 14959,
            "created_at": "2026-10-18",
            "amount_cents": 28238
          },
          {
            "id": 53976,
            "created_at": "2026-10-18",
            "amount_cents": 19207
          },
          {
            "id": 4600,
            "created_at": "2026-10-19",
            "amount_cents": 4839
          },
          {
            "id": 10950,
            "created_at": "2026-10-19",
            "amount_cents": 32883
          },
          {
            "id": 43845,
            "created_at": "2026-10-19",
            "amount_cents": 82655
          },
          {
            "id": 13847,
            "created_at": "2026-10-20",
            "amount_cents": 23738
          },
          {
            "id": 14192,
            "created_at": "2026-10-20",
            "amount_cents": 47278
          },
          {
            "id": 17371,
            "created_at": "2026-10-20",
            "amount_cents": 45353
          },
          {
            "id": 27104,
            "created_at": "2026-10-20",
            "amount_cents": 94365
          },
          {
            "id": 54372,
            "created_at": "2026-10-20",
            "amount_cents": 92325
          },
          {
            "id": 5601,
            "created_at": "2026-10-21",
            "amount_cents": 93479
          },
          {
            "id": 10856,
            "created_at": "2026-10-21",
            "amount_cents": 69502
          },
          {
            "id": 39296,
            "created_at": "2026-10-21",
            "amount_cents": 89953
          },
          {
            "id": 109,
            "created_at": "2026-10-22",
            "amount_cents": 10254
          },
          {
            "id": 1140,
            "created_at": "2026-10-22",
            "amount_cents": 83529
          },
          {
            "id": 34350,
            "created_at": "2026-10-22",
            "amount_cents": 68809
          },
          {
            "id": 36368,
            "created_at": "2026-10-22",
            "amount_cents": 16834
          },
          {
            "id": 52664,
            "created_at": "2026-10-22",
            "amount_cents": 37877
          },
          {
            "id": 10843,
            "created_at": "2026-10-23",
            "amount_cents": 9121
          },
          {
            "id": 39357,
            "created_at": "2026-10-23",
            "amount_cents": 51123
          },
          {
            "id": 2704,
            "created_at": "2026-10-24",
            "amount_cents": 52699
          },
          {
            "id": 9410,
            "created_at": "2026-10-24",
            "amount_cents": 87433
          },
          {
            "id": 48438,
            "created_at": "2026-10-24",
            "amount_cents": 84379
          },
          {
            "id": 1287,
            "created_at": "2026-10-25",
            "amount_cents": 65700
          },
          {
            "id": 32048,
            "created_at": "2026-10-25",
            "amount_cents": 49619
          },
          {
            "id": 27847,
            "created_at": "2026-10-26",
            "amount_cents": 66022
          },
          {
            "id": 44542,
            "created_at": "2026-10-26",
            "amount_cents": 13959
          },
          {
            "id": 32275,
            "created_at": "2026-10-27",
            "amount_cents": 41203
          },
          {
            "id": 3723,
            "created_at": "2026-10-28",
            "amount_cents": 59128
          },
          {
            "id": 24768,
            "created_at": "2026-10-28",
            "amount_cents": 31129
          },
          {
            "id": 45032,
            "created_at": "2026-10-28",
            "amount_cents": 1683
          },
          {
            "id": 11650,
            "created_at": "2026-10-30",
            "amount_cents": 32703
          },
          {
            "id": 46823,
            "created_at": "2026-10-31",
            "amount_cents": 33090
          }
        ]
      },
      {
        "id": "composite_cover",
        "sql": "SELECT id,created_at FROM events WHERE tenant_id=7 AND status='paid' AND created_at>='2026-10-01' AND created_at<'2026-11-01' ORDER BY created_at,id",
        "explain_json": {
          "query_block": {
            "select_id": 1,
            "cost_info": {
              "query_cost": "12.41"
            },
            "ordering_operation": {
              "using_filesort": false,
              "table": {
                "table_name": "events",
                "access_type": "range",
                "possible_keys": [
                  "idx_tenant_status_date"
                ],
                "key": "idx_tenant_status_date",
                "used_key_parts": [
                  "tenant_id",
                  "status",
                  "created_at"
                ],
                "key_length": "57",
                "rows_examined_per_scan": 55,
                "rows_produced_per_join": 55,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "6.91",
                  "eval_cost": "5.50",
                  "prefix_cost": "12.41",
                  "data_read_per_join": "31K"
                },
                "used_columns": [
                  "id",
                  "tenant_id",
                  "status",
                  "created_at"
                ],
                "attached_condition": "((`mysql_lab`.`events`.`status` = 'paid') and (`mysql_lab`.`events`.`tenant_id` = 7) and (`mysql_lab`.`events`.`created_at` >= DATE'2026-10-01') and (`mysql_lab`.`events`.`created_at` < DATE'2026-11-01'))"
              }
            }
          }
        },
        "explain_analyze": "-> Filter: ((`events`.`status` = 'paid') and (`events`.tenant_id = 7) and (`events`.created_at >= DATE'2026-10-01') and (`events`.created_at < DATE'2026-11-01'))  (cost=12.4 rows=55) (actual time=0.0125..0.0253 rows=55 loops=1)\n    -> Covering index range scan on events using idx_tenant_status_date over (tenant_id = 7 AND status = 'paid' AND '2026-10-01' <= created_at < '2026-11-01')  (cost=12.4 rows=55) (actual time=0.0113..0.0148 rows=55 loops=1)\n",
        "timings_ms": [
          0.712,
          1.002,
          0.943,
          0.69,
          0.672,
          0.658,
          0.967
        ],
        "distribution_ms": {
          "min": 0.658,
          "median": 0.712,
          "p95_nearest_rank": 1.002,
          "max": 1.002
        },
        "result_rows": 55,
        "result_sha256": "2675b859b34f6497d5431a898d097c087d386544bb6aed7a31399a6291b7ae7e",
        "rows": [
          {
            "id": 32268,
            "created_at": "2026-10-02"
          },
          {
            "id": 34452,
            "created_at": "2026-10-02"
          },
          {
            "id": 48530,
            "created_at": "2026-10-03"
          },
          {
            "id": 52649,
            "created_at": "2026-10-03"
          },
          {
            "id": 16722,
            "created_at": "2026-10-04"
          },
          {
            "id": 51382,
            "created_at": "2026-10-05"
          },
          {
            "id": 22407,
            "created_at": "2026-10-06"
          },
          {
            "id": 40969,
            "created_at": "2026-10-06"
          },
          {
            "id": 19171,
            "created_at": "2026-10-08"
          },
          {
            "id": 57425,
            "created_at": "2026-10-08"
          },
          {
            "id": 23847,
            "created_at": "2026-10-09"
          },
          {
            "id": 29652,
            "created_at": "2026-10-10"
          },
          {
            "id": 17720,
            "created_at": "2026-10-11"
          },
          {
            "id": 3478,
            "created_at": "2026-10-12"
          },
          {
            "id": 21702,
            "created_at": "2026-10-12"
          },
          {
            "id": 24711,
            "created_at": "2026-10-12"
          },
          {
            "id": 46281,
            "created_at": "2026-10-13"
          },
          {
            "id": 700,
            "created_at": "2026-10-15"
          },
          {
            "id": 48356,
            "created_at": "2026-10-15"
          },
          {
            "id": 57077,
            "created_at": "2026-10-16"
          },
          {
            "id": 4127,
            "created_at": "2026-10-17"
          },
          {
            "id": 32752,
            "created_at": "2026-10-17"
          },
          {
            "id": 14959,
            "created_at": "2026-10-18"
          },
          {
            "id": 53976,
            "created_at": "2026-10-18"
          },
          {
            "id": 4600,
            "created_at": "2026-10-19"
          },
          {
            "id": 10950,
            "created_at": "2026-10-19"
          },
          {
            "id": 43845,
            "created_at": "2026-10-19"
          },
          {
            "id": 13847,
            "created_at": "2026-10-20"
          },
          {
            "id": 14192,
            "created_at": "2026-10-20"
          },
          {
            "id": 17371,
            "created_at": "2026-10-20"
          },
          {
            "id": 27104,
            "created_at": "2026-10-20"
          },
          {
            "id": 54372,
            "created_at": "2026-10-20"
          },
          {
            "id": 5601,
            "created_at": "2026-10-21"
          },
          {
            "id": 10856,
            "created_at": "2026-10-21"
          },
          {
            "id": 39296,
            "created_at": "2026-10-21"
          },
          {
            "id": 109,
            "created_at": "2026-10-22"
          },
          {
            "id": 1140,
            "created_at": "2026-10-22"
          },
          {
            "id": 34350,
            "created_at": "2026-10-22"
          },
          {
            "id": 36368,
            "created_at": "2026-10-22"
          },
          {
            "id": 52664,
            "created_at": "2026-10-22"
          },
          {
            "id": 10843,
            "created_at": "2026-10-23"
          },
          {
            "id": 39357,
            "created_at": "2026-10-23"
          },
          {
            "id": 2704,
            "created_at": "2026-10-24"
          },
          {
            "id": 9410,
            "created_at": "2026-10-24"
          },
          {
            "id": 48438,
            "created_at": "2026-10-24"
          },
          {
            "id": 1287,
            "created_at": "2026-10-25"
          },
          {
            "id": 32048,
            "created_at": "2026-10-25"
          },
          {
            "id": 27847,
            "created_at": "2026-10-26"
          },
          {
            "id": 44542,
            "created_at": "2026-10-26"
          },
          {
            "id": 32275,
            "created_at": "2026-10-27"
          },
          {
            "id": 3723,
            "created_at": "2026-10-28"
          },
          {
            "id": 24768,
            "created_at": "2026-10-28"
          },
          {
            "id": 45032,
            "created_at": "2026-10-28"
          },
          {
            "id": 11650,
            "created_at": "2026-10-30"
          },
          {
            "id": 46823,
            "created_at": "2026-10-31"
          }
        ]
      },
      {
        "id": "expression_month",
        "sql": "SELECT id,created_at FROM events WHERE tenant_id=7 AND status='paid' AND DATE_FORMAT(created_at,'%Y-%m')='2026-10' ORDER BY created_at,id",
        "explain_json": {
          "query_block": {
            "select_id": 1,
            "cost_info": {
              "query_cost": "66.30"
            },
            "ordering_operation": {
              "using_filesort": false,
              "table": {
                "table_name": "events",
                "access_type": "ref",
                "possible_keys": [
                  "idx_tenant_status_date"
                ],
                "key": "idx_tenant_status_date",
                "used_key_parts": [
                  "tenant_id",
                  "status"
                ],
                "key_length": "54",
                "ref": [
                  "const",
                  "const"
                ],
                "rows_examined_per_scan": 608,
                "rows_produced_per_join": 608,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "5.50",
                  "eval_cost": "60.80",
                  "prefix_cost": "66.30",
                  "data_read_per_join": "346K"
                },
                "used_columns": [
                  "id",
                  "tenant_id",
                  "status",
                  "created_at"
                ],
                "attached_condition": "(date_format(`mysql_lab`.`events`.`created_at`,'%Y-%m') = '2026-10')"
              }
            }
          }
        },
        "explain_analyze": "-> Filter: (date_format(`events`.created_at,'%Y-%m') = '2026-10')  (cost=66.3 rows=608) (actual time=0.209..0.257 rows=55 loops=1)\n    -> Covering index lookup on events using idx_tenant_status_date (tenant_id=7, status='paid')  (cost=66.3 rows=608) (actual time=0.0296..0.149 rows=608 loops=1)\n",
        "timings_ms": [
          1.044,
          0.925,
          1.006,
          2.678,
          1.301,
          0.887,
          0.964
        ],
        "distribution_ms": {
          "min": 0.887,
          "median": 1.006,
          "p95_nearest_rank": 2.678,
          "max": 2.678
        },
        "result_rows": 55,
        "result_sha256": "2675b859b34f6497d5431a898d097c087d386544bb6aed7a31399a6291b7ae7e",
        "rows": [
          {
            "id": 32268,
            "created_at": "2026-10-02"
          },
          {
            "id": 34452,
            "created_at": "2026-10-02"
          },
          {
            "id": 48530,
            "created_at": "2026-10-03"
          },
          {
            "id": 52649,
            "created_at": "2026-10-03"
          },
          {
            "id": 16722,
            "created_at": "2026-10-04"
          },
          {
            "id": 51382,
            "created_at": "2026-10-05"
          },
          {
            "id": 22407,
            "created_at": "2026-10-06"
          },
          {
            "id": 40969,
            "created_at": "2026-10-06"
          },
          {
            "id": 19171,
            "created_at": "2026-10-08"
          },
          {
            "id": 57425,
            "created_at": "2026-10-08"
          },
          {
            "id": 23847,
            "created_at": "2026-10-09"
          },
          {
            "id": 29652,
            "created_at": "2026-10-10"
          },
          {
            "id": 17720,
            "created_at": "2026-10-11"
          },
          {
            "id": 3478,
            "created_at": "2026-10-12"
          },
          {
            "id": 21702,
            "created_at": "2026-10-12"
          },
          {
            "id": 24711,
            "created_at": "2026-10-12"
          },
          {
            "id": 46281,
            "created_at": "2026-10-13"
          },
          {
            "id": 700,
            "created_at": "2026-10-15"
          },
          {
            "id": 48356,
            "created_at": "2026-10-15"
          },
          {
            "id": 57077,
            "created_at": "2026-10-16"
          },
          {
            "id": 4127,
            "created_at": "2026-10-17"
          },
          {
            "id": 32752,
            "created_at": "2026-10-17"
          },
          {
            "id": 14959,
            "created_at": "2026-10-18"
          },
          {
            "id": 53976,
            "created_at": "2026-10-18"
          },
          {
            "id": 4600,
            "created_at": "2026-10-19"
          },
          {
            "id": 10950,
            "created_at": "2026-10-19"
          },
          {
            "id": 43845,
            "created_at": "2026-10-19"
          },
          {
            "id": 13847,
            "created_at": "2026-10-20"
          },
          {
            "id": 14192,
            "created_at": "2026-10-20"
          },
          {
            "id": 17371,
            "created_at": "2026-10-20"
          },
          {
            "id": 27104,
            "created_at": "2026-10-20"
          },
          {
            "id": 54372,
            "created_at": "2026-10-20"
          },
          {
            "id": 5601,
            "created_at": "2026-10-21"
          },
          {
            "id": 10856,
            "created_at": "2026-10-21"
          },
          {
            "id": 39296,
            "created_at": "2026-10-21"
          },
          {
            "id": 109,
            "created_at": "2026-10-22"
          },
          {
            "id": 1140,
            "created_at": "2026-10-22"
          },
          {
            "id": 34350,
            "created_at": "2026-10-22"
          },
          {
            "id": 36368,
            "created_at": "2026-10-22"
          },
          {
            "id": 52664,
            "created_at": "2026-10-22"
          },
          {
            "id": 10843,
            "created_at": "2026-10-23"
          },
          {
            "id": 39357,
            "created_at": "2026-10-23"
          },
          {
            "id": 2704,
            "created_at": "2026-10-24"
          },
          {
            "id": 9410,
            "created_at": "2026-10-24"
          },
          {
            "id": 48438,
            "created_at": "2026-10-24"
          },
          {
            "id": 1287,
            "created_at": "2026-10-25"
          },
          {
            "id": 32048,
            "created_at": "2026-10-25"
          },
          {
            "id": 27847,
            "created_at": "2026-10-26"
          },
          {
            "id": 44542,
            "created_at": "2026-10-26"
          },
          {
            "id": 32275,
            "created_at": "2026-10-27"
          },
          {
            "id": 3723,
            "created_at": "2026-10-28"
          },
          {
            "id": 24768,
            "created_at": "2026-10-28"
          },
          {
            "id": 45032,
            "created_at": "2026-10-28"
          },
          {
            "id": 11650,
            "created_at": "2026-10-30"
          },
          {
            "id": 46823,
            "created_at": "2026-10-31"
          }
        ]
      }
    ],
    "assertions_passed": true
  },
  "cleanup": {
    "remaining_lab_locks": 0,
    "workers_joined": true,
    "sessions_closed": true
  },
  "assertions_passed": true
}