6487f4b209554fdb29c6d67c5eb9f83445c991ba
Adds 3 nullable fields to MentorAssignment for drop lifecycle: - droppedAt: timestamp of drop (null while active) - droppedReason: free text (required when droppedAt is set) - droppedBy: 'mentor' | 'admin' | 'finalist_unconfirmed' Migration is purely additive: no DROP, no ALTER COLUMN, no RENAME. All existing rows automatically get NULL for the new columns.
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