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* fix(cdk): prevent duplicate blinded message processing with database constraints Add unique constraints on blinded_message column in both PostgreSQL and SQLite databases, and implement application-level checks to prevent duplicate blinded messages from being processed. Also ensure proper cleanup of melt requests after successful processing. * feat: db tests for unique * refactor(cdk-sql): consolidate blinded messages into blind signature table Migrate from separate blinded_messages table to unified blind_signature table. Add signed_time column and make c column nullable to track both pending blind messages (c=NULL) and completed signatures. Update insert/update logic to handle upsert scenarios for blind signature completion. * refactor(cdk-sql): remove unique constraint migration and filter queries for signed messages Remove database-level unique constraint on blinded_message and instead filter queries to only consider messages with signatures (c IS NOT NULL * refactor(database): improve blinded message duplicate detection using database constraints Replace manual duplicate checking with database constraint handling for better reliability and simplified code flow in melt request processing. * refactor(cdk-sql): optimize blind signature processing with batch queries Replace individual queries per blinded message with single batch query and HashMap lookup to eliminate N+1 query performance issue. * fix: signed time to swap sigs * refactor(cdk): split blinded message handling and improve duplicate detection - Split add_melt_request_and_blinded_messages into separate methods - Add blinded messages to database before signing in swap operations - Improve duplicate output detection with proper error handling - Make add_blinded_messages method accept optional quote_id for flexibility * refactor(cdk): add BlindedMessageWriter for improved transaction rollback - Add BlindedMessageWriter component for managing blinded message state - Implement proper rollback mechanisms in swap operations - Add delete_blinded_messages database interface for cleanup - Improve error handling with better state management