Major refactoring: Add user id to API routes

package-shared/functions/backend/api-cred.js

@@ -4,8 +4,9 @@ const fs = require("fs");
 const decrypt = require("./decrypt");
 
 /** @type {import("../../types").CheckApiCredentialsFn} */
-const grabApiCred = ({ key, database, table }) => {
+const grabApiCred = ({ key, database, table, user_id }) => {
     if (!key) return null;
+    if (!user_id) return null;
 
     try {
         const allowedKeysPath = process.env.DSQL_API_KEYS_PATH;
@@ -22,6 +23,8 @@ const grabApiCred = ({ key, database, table }) => {
             `${allowedKeysPath}/${ApiObject.sign}`
         );
 
+        if (String(ApiObject.user_id) !== String(user_id)) return null;
+
         if (!isApiKeyValid) return null;
         if (!ApiObject.target_database) return ApiObject;
         if (!database && ApiObject.target_database) return null;