feat: user buy media

backend/database/migrations/20241128075611_init.sql

@@ -33,6 +33,7 @@ CREATE TABLE
         id SERIAL8 PRIMARY KEY,
         user_id INT8 NOT NULL,
         tenant_id INT8 NOT NULL,
+        balance INT8 NOT NULL default 0,
         created_at timestamp NOT NULL default now()
     );
 
@@ -41,16 +42,6 @@ CREATE INDEX idx_users_tenants_tenant_id ON users_tenants (tenant_id);
 -- uniq user_id, tenant_id
 CREATE UNIQUE INDEX idx_users_tenants_user_id_tenant_id ON users_tenants (user_id, tenant_id);
 
-CREATE TABLE tenant_user_balances (
-    id SERIAL8 PRIMARY KEY,
-    user_id INT8 NOT NULL,
-    tenant_id INT8 NOT NULL,
-    balance INT8 NOT NULL
-);
-
-CREATE INDEX idx_tenant_user_balance_user_id ON tenant_user_balances (user_id);
-CREATE INDEX idx_tenant_user_balance_tenant_id ON tenant_user_balances (tenant_id);
-
 -- table user_balance_history
 CREATE TABLE user_balance_histories (
     id SERIAL8 PRIMARY KEY,