76d3403d0a
- Start with 4-char IDs for small databases (0-500 issues) - Scale to 5-char at 500-1500 issues, 6-char at 1500+ - Configurable via max_collision_prob, min/max_hash_length - Birthday paradox math ensures collision probability stays under threshold - Comprehensive tests and documentation - Collision calculator tool for analysis Also filed bd-aa744b to remove sequential ID code path.