Can't start node with chainDB generated from db-synthesizer

[abailly]

My goal is to produce a chain for a cluster of 5 testnet nodes spanning 3 epochs. I managed to do that using db-synthesizer but unfortunately when I try to use the generated data in the cluster, the nodes fail to use it and I get the following log entries:

[2025-09-03 13:35:28.1744Z][p1.example:ChainDB.LastShutdownUnclean](Info,19) ChainDB is not clean. Validating all immutable chunks
[2025-09-03 13:35:28.1745Z][p1.example:ChainDB.OpenEvent.StartedOpeningDB](Info,19) Started opening Chain DB
[2025-09-03 13:35:28.1746Z][p1.example:ChainDB.OpenEvent.StartedOpeningImmutableDB](Info,19) Started opening Immutable DB
[2025-09-03 13:35:28.1748Z][p1.example:ChainDB.ImmDbEvent.NoValidLastLocation](Info,19) No valid last location was found. Starting from Genesis.
[2025-09-03 13:35:28.1751Z][p1.example:ChainDB.OpenEvent.OpenedImmutableDB](Info,19) Opened imm db with immutable tip at genesis (origin) and chunk 0
[2025-09-03 13:35:28.1751Z][p1.example:ChainDB.OpenEvent.StartedOpeningVolatileDB](Info,19) Started opening Volatile DB
[2025-09-03 13:35:28.1753Z][p1.example:ChainDB.OpenEvent.OpenedVolatileDB](Info,19) Opened empty Volatile DB
[2025-09-03 13:35:28.1753Z][p1.example:ChainDB.OpenEvent.StartedOpeningLgrDB](Info,19) Started opening Ledger DB
[2025-09-03 13:35:28.1754Z][p1.example:ChainDB.LedgerEvent.Replay.ReplayStart.ReplayFromGenesis](Info,19) Replaying ledger from genesis
[2025-09-03 13:35:28.1760Z][p1.example:ChainDB.OpenEvent.OpenedLgrDB](Info,19) Opened lgr db
[2025-09-03 13:35:28.1761Z][p1.example:ChainDB.InitChainSelEvent.StartedInitChainSelection](Info,19) Started initial chain selection
[2025-09-03 13:35:28.1761Z][p1.example:ChainDB.InitChainSelEvent.InitialChainSelected](Info,19) Initial chain selected
[2025-09-03 13:35:28.1762Z][p1.example:ChainDB.OpenEvent.OpenedDB](Info,19) Opened db with immutable tip at genesis (origin) and tip genesis (origin)

I had a quick look at the code and spotted where the trace was emitted but I don't have any obvious reason why the DB would be deemed incorrect. Any insights would be much appreciated?

[amesgen]

Can you post the configuration file(s) you used for db-synthesizer as well as for the nodes in your cluster?

[abailly]

Thanks for reaching out @amesgen ! And my apologies: problem was in between the keyboard and chair, I did not put the files in the right location 🤦
I still have an issue because I generated the blocks with a too recent version of the synthesizer so I get:

[2025-09-03 14:42:18.7858Z][p1.example:ChainDB.ImmDbEvent.ChunkValidation.ValidatedChunk](Info,19) Validated chunk no. 40 out of 57. Progress: 70.69%
[2025-09-03 14:42:18.7858Z][p1.example:ChainDB.ImmDbEvent.ChunkValidation.StartedValidatingChunk](Info,19) Validating chunk no. 41 out of 57. Progress: 70.69%
[2025-09-03 14:42:18.7861Z][p1.example:ChainDB.ImmDbEvent.ChunkValidation.InvalidChunkFile](Warning,19) The chunk file with number 41 is invalid: ChunkErrRead (ReadFailed (DeserialiseFailure 404 "Unsupported version value: 12. Expected value in bounds: [0, 11]"))
[2025-09-03 14:42:18.7862Z][p1.example:ChainDB.ImmDbEvent.ChunkValidation.RewriteSecondaryIndex](Warning,19) Rewriting the secondary index for the chunk file with number 41.
[2025-09-03 14:42:18.7865Z][p1.example:ChainDB.ImmDbEvent.ChunkValidation.RewritePrimaryIndex](Warning,19) Rewriting the primary index for the chunk file with number 41.
[2025-09-03 14:42:18.7867Z][p1.example:ChainDB.ImmDbEvent.ChunkValidation.ValidatedChunk](Info,19) Validated chunk no. 41 out of 57. Progress: 72.41%

but that error is "easy" to fix :)