feat(migrations): add index to relations for asset_from and asset_to

Closes owasp-amass#30

Author: rynmrtn

migrations/postgres/008_rel_type_idx.sql

@@ -1,5 +1,5 @@
 -- +migrate Up
-CREATE INDEX idx_rel_type ON relations (type);
+CREATE INDEX IF NOT EXISTS idx_rel_type ON relations (type);
 
 -- +migrate Down
 DROP INDEX IF EXISTS idx_rel_type;

migrations/postgres/009_rel_asset_id_idx.sql

@@ -0,0 +1,7 @@
+-- +migrate Up
+CREATE INDEX IF NOT EXISTS idx_rel_from_asset ON relations (from_asset_id);
+CREATE INDEX IF NOT EXISTS idx_rel_to_asset ON relations (to_asset_id);
+
+-- +migrate Down
+DROP INDEX IF EXISTS idx_rel_from_asset;
+DROP INDEX IF EXISTS idx_rel_to_asset;

migrations/sqlite3/007_rel_asset_id_idx.sql

@@ -0,0 +1,7 @@
+-- +migrate Up
+CREATE INDEX idx_rel_from_asset ON relations (from_asset_id);
+CREATE INDEX idx_rel_to_asset ON relations (to_asset_id);
+
+-- +migrate Down
+DROP INDEX IF EXISTS idx_rel_from_asset;
+DROP INDEX IF EXISTS idx_rel_to_asset;