ReceiptStore Add littidx backend (LittDB bodies + pebble tag index)

sei-db/config/receipt_config.go

@@ -82,10 +82,10 @@ func ReadReceiptConfig(opts AppOptions) (ReceiptStoreConfig, error) {
 		}
 		backend = strings.ToLower(strings.TrimSpace(backend))
 		switch backend {
-		case "pebbledb", "pebble":
+		case "pebbledb", "pebble", "littidx":
 			cfg.Backend = backend
 		default:
-			return cfg, fmt.Errorf("unsupported receipt-store backend %q; supported: pebbledb", backend)
+			return cfg, fmt.Errorf("unsupported receipt-store backend %q; supported: pebbledb, littidx", backend)
 		}
 	}
 	if v := opts.Get(flagRSAsyncWriteBuffer); v != nil {

sei-db/db_engine/pebbledb/db.go

@@ -165,6 +165,15 @@ func (p *pebbleDB) Delete(key []byte, opts types.WriteOptions) error {
 	return nil
 }
 
+// DeleteRange deletes every key in [start, end) with a single range tombstone
+// (O(1) write) rather than iterating and point-deleting each key.
+func (p *pebbleDB) DeleteRange(start, end []byte, opts types.WriteOptions) error {
+	if err := p.db.DeleteRange(start, end, toPebbleWriteOpts(opts)); err != nil {
+		return fmt.Errorf("failed to delete range in database: %w", err)
+	}
+	return nil
+}
+
 func (p *pebbleDB) NewIter(opts *types.IterOptions) (dbm.Iterator, error) {
 	var iopts *pebble.IterOptions
 	if opts != nil {

sei-db/ledger_db/receipt/export_test.go

@@ -15,3 +15,10 @@ func RecoverReceiptStore(changelogPath string, db types2.StateStore) error {
 func GetLogsForTx(receipt *types.Receipt, logStartIndex uint) []*ethtypes.Log {
 	return getLogsForTx(receipt, logStartIndex)
 }
+
+// PruneLittIdx runs a synchronous prune on a littidx store, removing every
+// block below cutoff. Test-only hook so prune behavior can be asserted without
+// waiting on the background interval.
+func PruneLittIdx(store ReceiptStore, cutoff uint64) error {
+	return store.(*littReceiptStore).pruneBlocksBelow(cutoff)
+}