- Create firmware_releases table to store latest available firmware versions
- Create device_firmware_history table to track version changes over time
- Add FirmwareRelease and DeviceFirmwareHistory Ecto schemas with validations
- Add comprehensive tests for both schemas (23 tests, 100% coverage)
firmware_releases stores one record per vendor/product_line with latest version.
device_firmware_history is append-only audit log of device firmware changes.
Part of firmware version tracking system for MikroTik (extensible to other vendors).
Graham McIntire
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