{"record":{"id":"dd835638597b08ab","repo":"vxcontrol/pentagi","slug":"failed-to-restore-assistant-msg-chain-w","errorCode":null,"errorMessage":"failed to restore assistant msg chain: %w","messagePattern":"failed to restore assistant msg chain: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"backend/pkg/providers/assistant.go","lineNumber":127,"sourceCode":"\t\t\"provider\":     ap.fp.Type(),\n\t\t\"assistant_id\": ap.id,\n\t\t\"flow_id\":      ap.fp.ID(),\n\t})\n\n\tsystemPrompt, err := ap.getAssistantSystemPrompt(ctx)\n\tif err != nil {\n\t\tlogger.WithError(err).Error(\"failed to get assistant system prompt\")\n\t\treturn 0, fmt.Errorf(\"failed to get assistant system prompt: %w\", err)\n\t}\n\n\toptAgentType := pconfig.OptionsTypeAssistant\n\tmsgChainType := database.MsgchainTypeAssistant\n\tap.msgChainID, _, err = ap.fp.restoreChain(\n\t\tctx, nil, nil, optAgentType, msgChainType, systemPrompt, \"\",\n\t)\n\tif err != nil {\n\t\tlogger.WithError(err).Error(\"failed to restore assistant msg chain\")\n\t\treturn 0, fmt.Errorf(\"failed to restore assistant msg chain: %w\", err)\n\t}\n\n\treturn ap.msgChainID, nil\n}\n\nfunc (ap *assistantProvider) PerformAgentChain(ctx context.Context) error {\n\tctx, span := obs.Observer.NewSpan(ctx, obs.SpanKindInternal, \"providers.assistantProvider.PerformAgentChain\")\n\tdefer span.End()\n\n\tlogger := logrus.WithContext(ctx).WithFields(logrus.Fields{\n\t\t\"provider\":     ap.fp.Type(),\n\t\t\"assistant_id\": ap.id,\n\t\t\"flow_id\":      ap.fp.ID(),\n\t\t\"msg_chain_id\": ap.msgChainID,\n\t})\n\n\tuseAgents, err := ap.getAssistantUseAgents(ctx)\n\tif err != nil {","sourceCodeStart":109,"sourceCodeEnd":145,"githubUrl":"https://github.com/vxcontrol/pentagi/blob/ea665308baaff015b226f308438a68d929d0f29b/backend/pkg/providers/assistant.go#L109-L145","documentation":"PrepareAgentChain failed while restoring the assistant message chain via ap.fp.restoreChain, which loads (or creates) the persisted Msgchain row for the assistant agent. Without a restored chain ID the assistant cannot continue its conversation history, so the flow preparation aborts with this wrapped error.","triggerScenarios":"restoreChain(ctx, nil, nil, OptionsTypeAssistant, MsgchainTypeAssistant, systemPrompt, \"\") fails: msgchain row lookup/insert fails, foreign-key issues on flow_id, DB unavailable, or context cancelled mid-query.","commonSituations":"Postgres outage or connection pool exhaustion; corrupted/partial flow data (flow deleted concurrently); migration drift leaving msgchain schema stale; restoring a chain for a flow whose ID no longer exists.","solutions":["Inspect the wrapped DB error from restoreChain","Verify Postgres connectivity and that migrations in backend/migrations/sql are applied","Check the msgchain/flow rows for the given flow_id (orphans or duplicates)","Retry the flow creation; if persistent, check backend logs just before this error for the underlying sql error"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"// ensure flow row exists before restoring the chain\n// SELECT id FROM flows WHERE id = ?","typeGuard":null,"tryCatchPattern":"id, err := ap.PrepareAgentChain(ctx)\nif err != nil {\n    if isTransientDBError(err) {\n        time.Sleep(backoff)\n        id, err = ap.PrepareAgentChain(ctx) // bounded retry\n    }\n    if err != nil { return err }\n}","preventionTips":["Keep Postgres reachable with sane pool sizes and health checks","Apply all goose migrations before starting workers","Avoid concurrent flow deletion while agents restore chains","Wrap restoreChain retries with bounded backoff and context timeout"],"tags":["database","assistant","msgchain","agent-chain"],"backgroundTag":"msgchain-restore-failed","analyzedSha":"ea665308baaff015b226f308438a68d929d0f29b","analyzedAt":"2026-09-01T14:16:31.421Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}