[v3] increase database name character limit to 128

Can the character length limits for database names, table names, etc., be relaxed? Currently, they are restricted to 1–64 characters, and we would like to extend this to 1–128 characters.

No files or tests are named in the issue. Start by locating the validation that enforces the current 1–64 character limit for database, table, and related names, then inspect existing tests for those identifiers. Done means the relevant names accept 1–128 characters and the validation tests pass without weakening other constraints.

Written by the indexing model from the issue text.