JuliusBrussee/caveman · error

read current memory: %w

Error message

read current memory: %w

What it means

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.

Source

Thrown at mem/store.go:222

	}
	if strings.TrimSpace(newText) == "" {
		return Memory{}, fmt.Errorf("cannot supersede with empty text")
	}
	if err := validateMemorySize(newText); err != nil {
		return Memory{}, err
	}
	tx, err := s.db.Begin()
	if err != nil {
		return Memory{}, fmt.Errorf("supersede begin: %w", err)
	}
	defer tx.Rollback()

	var old Memory
	if err := scanMemory(tx.QueryRow(memorySelect+` WHERE id = ? AND valid_until IS NULL`, oldID), &old); err != nil {
		if err == sql.ErrNoRows {
			return Memory{}, fmt.Errorf("memory %s is not current", oldID)
		}
		return Memory{}, fmt.Errorf("read current memory: %w", err)
	}
	if old.Text == newText {
		return Memory{}, fmt.Errorf("replacement text is identical to current memory")
	}
	newID := memID(newText)
	var exists int
	if err := tx.QueryRow(`SELECT COUNT(*) FROM memories WHERE id = ?`, newID).Scan(&exists); err != nil {
		return Memory{}, fmt.Errorf("check replacement memory: %w", err)
	}
	if exists > 0 {
		return Memory{}, fmt.Errorf("replacement memory %s already exists", newID)
	}
	now := time.Now().UTC().Format(time.RFC3339Nano)
	if _, err := tx.Exec(
		`INSERT INTO memories
		   (id, text, created_at, valid_from, supersedes)
		 VALUES (?, ?, ?, ?, ?)`,
		newID, newText, now, now, oldID,

View on GitHub (pinned to 766dce6b13)

Solutions

1. Retry the supersede after transient db errors
2. Check db integrity if persistent
3. Inspect the wrapped scan error

When it happens

Trigger: Thrown at mem/store.go:222 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of JuliusBrussee/caveman@766dce6b13 (2026-08-18). Data as JSON: /api/errors/bad788c84bda0c06. Report an issue: GitHub.