Merge pull request #46 from vulcanize/release-v3.0.5

drop un-unique indexes

db/post_batch_processing_migrations/00022_drop_non_unique_indexes.sql

@@ -0,0 +1,9 @@
+-- +goose Up
+DROP INDEX eth.log_cids_index;
+DROP INDEX eth.tx_tx_hash_index;
+DROP INDEX eth.header_block_hash_index;
+
+-- +goose Down
+CREATE INDEX header_block_hash_index ON eth.header_cids USING btree (block_hash);
+CREATE INDEX tx_tx_hash_index ON eth.transaction_cids USING btree (tx_hash);
+CREATE INDEX log_cids_index ON eth.log_cids USING btree (rct_id, index);