{"record":{"id":"bad788c84bda0c06","repo":"JuliusBrussee/caveman","slug":"read-current-memory-w","errorCode":null,"errorMessage":"read current memory: %w","messagePattern":"read current memory: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"mem/store.go","lineNumber":222,"sourceCode":"\t}\n\tif strings.TrimSpace(newText) == \"\" {\n\t\treturn Memory{}, fmt.Errorf(\"cannot supersede with empty text\")\n\t}\n\tif err := validateMemorySize(newText); err != nil {\n\t\treturn Memory{}, err\n\t}\n\ttx, err := s.db.Begin()\n\tif err != nil {\n\t\treturn Memory{}, fmt.Errorf(\"supersede begin: %w\", err)\n\t}\n\tdefer tx.Rollback()\n\n\tvar old Memory\n\tif err := scanMemory(tx.QueryRow(memorySelect+` WHERE id = ? AND valid_until IS NULL`, oldID), &old); err != nil {\n\t\tif err == sql.ErrNoRows {\n\t\t\treturn Memory{}, fmt.Errorf(\"memory %s is not current\", oldID)\n\t\t}\n\t\treturn Memory{}, fmt.Errorf(\"read current memory: %w\", err)\n\t}\n\tif old.Text == newText {\n\t\treturn Memory{}, fmt.Errorf(\"replacement text is identical to current memory\")\n\t}\n\tnewID := memID(newText)\n\tvar exists int\n\tif err := tx.QueryRow(`SELECT COUNT(*) FROM memories WHERE id = ?`, newID).Scan(&exists); err != nil {\n\t\treturn Memory{}, fmt.Errorf(\"check replacement memory: %w\", err)\n\t}\n\tif exists > 0 {\n\t\treturn Memory{}, fmt.Errorf(\"replacement memory %s already exists\", newID)\n\t}\n\tnow := time.Now().UTC().Format(time.RFC3339Nano)\n\tif _, err := tx.Exec(\n\t\t`INSERT INTO memories\n\t\t   (id, text, created_at, valid_from, supersedes)\n\t\t VALUES (?, ?, ?, ?, ?)`,\n\t\tnewID, newText, now, now, oldID,","sourceCodeStart":204,"sourceCodeEnd":240,"githubUrl":"https://github.com/JuliusBrussee/caveman/blob/766dce6b1394ebb56a3090748d5a0240a5aefb36/mem/store.go#L204-L240","documentation":"Inside the supersede transaction, scanning the current version of the old memory failed for a reason other than not-found (e.g. corrupt row or DB error). The wrapped error carries the scan failure; the transaction rolls back.","triggerScenarios":"Thrown at mem/store.go:222 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Retry the supersede after transient db errors","Check db integrity if persistent","Inspect the wrapped scan error"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"766dce6b1394ebb56a3090748d5a0240a5aefb36","analyzedAt":"2026-08-18T03:14:35.516Z","contentChangedAt":"2026-08-18T03:14:35.516Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}