diff --git a/backend/sql/database.ts b/backend/sql/database.ts
index f09edbb..39b8593 100644
--- a/backend/sql/database.ts
+++ b/backend/sql/database.ts
@@ -1,43 +1,4 @@
-import { AssFile, AssUser, NID, UploadToken } from "ass";
-
-export type DatabaseValue = AssFile | AssUser | UploadToken;
-export type DatabaseTable = 'assfiles' | 'assusers' | 'asstokens';
-
-// todo: move this to types.d.ts
-/**
- * interface for database classes
- */
-export interface Database {
-    /**
-     * preform database initialization tasks
-     */
-    open(): Promise<void>;
-
-    /**
-     * preform database suspension tasks
-     */
-    close(): Promise<void>;
-
-    /**
-     * set up database
-     */
-    configure(): Promise<void>;
-
-    /**
-     * put a value in the database
-     */
-    put(table: DatabaseTable, key: NID, data: DatabaseValue): Promise<void>;
-    
-    /**
-     * get a value from the database
-     */
-    get(table: DatabaseTable, key: NID): Promise<DatabaseValue | undefined>;
-    
-    /**
-     * get all values from the database
-     */
-    getAll(table: DatabaseTable): Promise<{ [key: string]: DatabaseValue | undefined }[]>;
-}
+import { NID, Database, DatabaseTable, DatabaseValue } from "ass";
 
 export class DBManager {
     private static _db:      Database;
diff --git a/backend/sql/json.ts b/backend/sql/json.ts
index 4086a75..789772f 100644
--- a/backend/sql/json.ts
+++ b/backend/sql/json.ts
@@ -1,9 +1,8 @@
-import { AssFile, AssUser, FilesSchema, UsersSchema } from 'ass';
+import { AssFile, AssUser, FilesSchema, UsersSchema, Database, DatabaseTable, DatabaseValue } from 'ass';
 
 import path, { resolve } from 'path';
 import fs from 'fs-extra';
 
-import { Database, DatabaseTable, DatabaseValue } from './database.js';
 import { log } from '../log.js';
 import { nanoid } from '../generators.js';
 
diff --git a/backend/sql/mysql.ts b/backend/sql/mysql.ts
index 7072b86..4a9dd81 100644
--- a/backend/sql/mysql.ts
+++ b/backend/sql/mysql.ts
@@ -1,10 +1,9 @@
-import { AssFile, AssUser, NID, UploadToken } from 'ass';
+import { AssFile, AssUser, NID, UploadToken, Database, DatabaseTable, DatabaseValue } from 'ass';
 
 import mysql, { Pool } from 'mysql2/promise';
 
 import { log } from '../log.js';
 import { UserConfig } from '../UserConfig.js';
-import { Database, DatabaseTable, DatabaseValue } from './database.js';
 
 export class MySQLDatabase implements Database {
 	private _pool: Pool;
diff --git a/backend/sql/postgres.ts b/backend/sql/postgres.ts
index 6b4280c..033f7d0 100644
--- a/backend/sql/postgres.ts
+++ b/backend/sql/postgres.ts
@@ -1,8 +1,7 @@
-import { PostgresConfiguration } from 'ass';
+import { PostgresConfiguration, Database, DatabaseTable, DatabaseValue } from 'ass';
 
 import pg from 'pg';
 import { log } from '../log.js';
-import { Database, DatabaseTable, DatabaseValue } from './database.js';
 import { UserConfig } from '../UserConfig.js';
 
 /**
diff --git a/common/types.d.ts b/common/types.d.ts
index 2d13284..fe32941 100644
--- a/common/types.d.ts
+++ b/common/types.d.ts
@@ -3,6 +3,9 @@ declare module 'ass' {
 
 	type IdType = 'random' | 'original' | 'gfycat' | 'timestamp' | 'zws'
 
+	export type DatabaseValue = AssFile | AssUser | UploadToken;
+	export type DatabaseTable = 'assfiles' | 'assusers' | 'asstokens';
+
 	/**
 	 * Core Express server config.
 	 * This is separate from the user configuration starting in 0.15.0
@@ -51,6 +54,42 @@ declare module 'ass' {
 		}
 	}
 
+	/**
+	 * interface for database classes
+	 */
+
+	export interface Database {
+		/**
+		 * preform database initialization tasks
+		 */
+		open(): Promise<void>;
+
+		/**
+		 * preform database suspension tasks
+		 */
+		close(): Promise<void>;
+
+		/**
+		 * set up database
+		 */
+		configure(): Promise<void>;
+
+		/**
+		 * put a value in the database
+		 */
+		put(table: DatabaseTable, key: NID, data: DatabaseValue): Promise<void>;
+
+		/**
+		 * get a value from the database
+		 */
+		get(table: DatabaseTable, key: NID): Promise<DatabaseValue | undefined>;
+
+		/**
+		 * get all values from the database
+		 */
+		getAll(table: DatabaseTable): Promise<{ [key: string]: DatabaseValue | undefined; }[]>;
+	}
+
 	interface DatabaseConfiguration {
 		kind: 'mysql' | 'postgres' | 'json';
 		options?: MySQLConfiguration | PostgresConfiguration;