Migrate all 32-byte hash fields from TEXT (64-char hex) to BLOB
(32 bytes) for ~50% storage savings on hash columns.
Changes:
- Add src/db/blob.rs with ToBlob/FromBlob traits for hash types
- Update all table schemas to use BLOB for hash columns
- Replace .to_hex() with .to_blob() for DB inserts
- Replace ::from_hex() with ::from_blob() for DB reads
- Use SQL hex() function where API responses need hex strings
- Bump DB_VERSION from 4 to 5
Affected tables: tx, pool, pool_history_entry, utxo_spending,
utxo_funding, user_action, auth_chain_entry, bcmr_data,
bcmr_failure, bcmr_well_known, crc20, crc20_candidates,
delphi_entry, cached_token_metrics
Fixes#1
Remove errant UNIQUE INDEX on (utxo, txid) that conflicted with the
PRIMARY KEY (token_id, utxo, txid). A single transaction can update
auth chains for multiple tokens, requiring the same (utxo, txid) pair
to exist with different token_ids. The unique index blocked this.
The index was also unnecessary - EXPLAIN QUERY PLAN shows the PRIMARY
KEY index is used for all bcmr_failure lookups.
Add test covering multi-token failure recording.
