Houmgaor 01b829d0e9 feat(savedata): add tier 2 integrity protections ...

Strengthen savedata persistence against corruption and race conditions:

- SHA-256 checksum: hash the decompressed blob on every save, store in
  new savedata_hash column, verify on load to detect silent corruption.
  Pre-existing characters with no hash are silently upgraded on next save.
- Atomic transactions: wrap character data + house data + hash + backup
  into a single DB transaction via SaveCharacterDataAtomic, so a crash
  mid-save never leaves partial state.
- Per-character save mutex: CharacterLocks (sync.Map of charID → Mutex)
  serializes concurrent saves for the same character, preventing races
  that could defeat corruption detection. Different characters remain
  fully independent.

Migration 0008 adds the savedata_hash column to the characters table.

2026-03-17 19:21:55 +01:00

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seed

docs(gacha): clarify G1-GG vs ZZ configuration to prevent client crashes (#175)

2026-03-17 19:11:59 +01:00

sql

feat(savedata): add tier 2 integrity protections

2026-03-17 19:21:55 +01:00

migrations_test.go

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migrations.go

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