Transaction Logger

The Transaction Logger is a software component designed for use in industrial computer, electronic, and optical product manufacturing environments. As part of the Rollback Handler system, it persistently records every transaction operation, including data modifications, system state changes, and user actions. The logger creates a chronological log that enables the system to reconstruct transaction sequences, verify data integrity, and facilitate recovery operations when rollbacks are required due to errors or system failures. The logger operates by intercepting transaction requests, capturing relevant metadata such as timestamps, user IDs, operation types, and affected data, and writing this information to a persistent storage medium. It typically uses write-ahead logging (WAL) principles to ensure data consistency: log entries are written before the actual transaction is committed, allowing for complete recovery even in case of system crashes. Key parameters include a logging throughput of 10,000–50,000 transactions per second (sustained rate; peak may be higher), a configurable log retention period of 30–365 days, and a timestamp resolution of 1 microsecond for audit trails. Clock drift is specified as ±0.01 seconds per day with NTP synchronization. Data integrity is ensured via SHA-256 hash chaining (FIPS 180-4). All values are reference ranges and must be verified with the legal manufacturer or supplier for the specific model and application. Standards listed (e.g., IEC 60068, IEC 60529) are procurement references, not proof of certification.

The Transaction Logger intercepts transaction requests from the Rollback Handler system. It captures metadata including timestamp, user ID, operation type, and affected data, then writes this information to persistent storage using write-ahead logging (WAL). This ensures that log entries are durably stored before the transaction is committed, enabling recovery after crashes. The logger maintains a chronological log that supports audit trails and integrity verification via hash chaining.