perf: add composite indexes on event table for NFT query optimization

- idx_event_addr_t0_t3: (address, topic0, topic3, block_number DESC,
  log_index DESC) — covers NFT detail page transfer lookups with sort
- idx_event_t0_t1: (topic0, topic1) — speeds up contract discovery and
  ownership reconstruction (from-address branch)
- idx_event_t0_t2: (topic0, topic2) — same for to-address branch
- Add indexes to rsk-explorer-database.sql base creation script
- Add testnet staging NFT holder addresses to index script

Made-with: Cursor

Author: nicov-iov

prisma/rsk-explorer-database.sql

@@ -483,6 +483,9 @@ CREATE INDEX idx_event_transaction_hash_log_index ON event(transaction_hash, log
 CREATE INDEX idx_event_address_event_event_id ON event(address, event, event_id DESC);
 CREATE INDEX idx_event_event ON event(event);
 CREATE INDEX idx_event_lowercase_event ON event(lower((event)::text));
+CREATE INDEX idx_event_addr_t0_t3 ON event(address, topic0, topic3, block_number DESC, log_index DESC);
+CREATE INDEX idx_event_t0_t1 ON event(topic0, topic1);
+CREATE INDEX idx_event_t0_t2 ON event(topic0, topic2);
 
 CREATE TABLE address_in_event (
 event_id VARCHAR,

prisma/schema.prisma

@@ -191,6 +191,9 @@ model event {
   @@index([transactionHash, logIndex], map: "idx_event_transaction_hash_log_index")
   @@index([address, event, eventId(sort: Desc)], map: "idx_event_address_event_event_id")
   @@index([event], map: "idx_event_event")
+  @@index([address, topic0, topic3, blockNumber(sort: Desc), logIndex(sort: Desc)], map: "idx_event_addr_t0_t3")
+  @@index([topic0, topic1], map: "idx_event_t0_t1")
+  @@index([topic0, topic2], map: "idx_event_t0_t2")
 }
 
 model internal_transaction {