- Key length is the most natural signal, just strlen(). If your base62 keys are typically 3-5 characters and you start seeing 15+, that's a reasonable trigger.
- Max key length in the list is cheap to track if you're already iterating for display or sync.
1. generate_n_keys_between: if you know you're inserting N items at once (e.g. a bulk paste or drag of multiple items), it distributes them evenly in a single call rather than chaining N sequential generate_key_between calls, which would produce progressively longer keys.
2. Higher bases: base62 (default) and base95 give you a much wider branching factor per character than base10, so keys stay shorter under the same insertion patterns.