Code cleanup

Moved migrations/ into entity/
MessageIds now return errors except for API ones

migrations/0001_init.down.sql

@@ -1,3 +0,0 @@
-DROP TABLE account;
-
-DROP TABLE master_pass;

migrations/0001_init.up.sql

@@ -1,16 +0,0 @@
-CREATE TABLE
-    master_pass (
-        user_id BIGINT UNSIGNED NOT NULL PRIMARY KEY,
-        salt BINARY(64) NOT NULL,
-        password_hash BINARY(64) NOT NULL
-    );
-
-CREATE TABLE
-    account (
-        user_id BIGINT UNSIGNED NOT NULL,
-        name VARCHAR(255) NOT NULL,
-        salt BINARY(64) NOT NULL,
-        enc_login VARBINARY(256) NOT NULL,
-        enc_password VARBINARY(256) NOT NULL,
-        PRIMARY KEY (user_id, name)
-    );