Append-Only Version History for Expert Advisor Parameters
Summary
The article presents a way to preserve changes to an Expert Advisor’s settings in a single append-only binary file. Each fixed-size record groups version metadata, adjustable trading parameters, optional performance metrics, and an integrity checksum. The EA creates an initial record only when the file is empty, reads the latest record by its position, and compares a newly calculated checksum with the saved one. If adjustable parameters have changed, it increments the version, updates the timestamp, and appends a record rather than overwriting prior settings.
The method is intended to make configurations easier to recover, compare, and reproduce across manual changes, optimization, or EA operation. The checksum helps detect changes or corruption, though the article notes that floating-point values may need scaling for checksum calculation. It does not discuss schema migration, compatibility after changing the struct layout, or file-recovery behavior, and it provides no empirical evaluation. The record design and append logic are implementation guidance, not a trading strategy.
Key ideas
- Store each parameter snapshot as one fixed-size struct record in an append-only binary file.
- Separate version metadata, adjustable parameters, optional performance measures, and checksum fields.
- Create the first record only when the file has no existing data.
- Load the latest record using its offset, then compare checksums to determine whether to append a new version.
- A checksum can reveal changes or corruption, but the article flags care with floating-point values.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.