fix: add index for session_info on user_id, app_id

Author: tamassoltesz

CHANGELOG.md

@@ -7,6 +7,14 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+-  Adds indexing for `session_info` table on `user_id, app_id` columns
+
+### Migration
+
+```sql
+CREATE INDEX IF NOT EXISTS session_info_user_id_app_id_index ON session_info (user_id, app_id);
+```
+
 ## [7.3.0] 
 
 - Adds tables and queries for Bulk Import

src/main/java/io/supertokens/storage/postgresql/queries/GeneralQueries.java

@@ -335,6 +335,7 @@ public static void createTablesIfNotExists(Start start, Connection con) throws S
 
                     // index
                     update(con, getQueryToCreateSessionExpiryIndex(start), NO_OP_SETTER);
+                    update(con, getQueryToCreateSessionAppIdUserIdIndex(start), NO_OP_SETTER);
                     update(con, getQueryToCreateTenantIdIndexForSessionInfoTable(start), NO_OP_SETTER);
                 }
 

src/main/java/io/supertokens/storage/postgresql/queries/SessionQueries.java

@@ -100,6 +100,11 @@ static String getQueryToCreateSessionExpiryIndex(Start start) {
                 + Config.getConfig(start).getSessionInfoTable() + "(expires_at);";
     }
 
+    static String getQueryToCreateSessionAppIdUserIdIndex(Start start) {
+        return "CREATE INDEX IF NOT EXISTS session_info_user_id_app_id_index ON "
+                + Config.getConfig(start).getSessionInfoTable() + "(user_id, app_id);";
+    }
+
     public static void createNewSession(Start start, TenantIdentifier tenantIdentifier, String sessionHandle,
                                         String userId, String refreshTokenHash2,
                                         JsonObject userDataInDatabase, long expiry, JsonObject userDataInJWT,