Manage Better Auth user data in Convex component tables. Use when: (1) need to
manually verify user email in development, (2) "Email not verified" error blocking
login, (3) need to modify Better Auth user/session/account data directly, (4) can't
write mutations to access component tables, (5) debugging auth issues in Convex +
Better Auth setup. Covers CLI data access, export/import workflow, and common gotchas.