feat add tenant users

backend/database/migrations/20251215113803_tenants.sql

@@ -0,0 +1,29 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS tenants(
+    id bigserial PRIMARY KEY,
+    user_id bigint NOT NULL,
+    code varchar(64) NOT NULL,
+    uuid uuid NOT NULL,
+    name varchar(128) NOT NULL DEFAULT '',
+    status varchar(64) NOT NULL DEFAULT '',
+    config jsonb NOT NULL DEFAULT '{}'::jsonb,
+    expired_at timestamptz,
+    created_at timestamptz NOT NULL DEFAULT now(),
+    updated_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS ux_tenants_code_lower ON tenants(lower(code));
+
+CREATE UNIQUE INDEX IF NOT EXISTS ux_tenants_uuid ON tenants(uuid);
+
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+DROP INDEX IF EXISTS ux_tenants_uuid;
+
+DROP INDEX IF EXISTS ux_tenants_code_lower;
+
+DROP TABLE IF EXISTS tenants;
+
+-- +goose StatementEnd

backend/database/migrations/20251216011456_tenant_users.sql

@@ -0,0 +1,20 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS tenant_users(
+    id bigserial PRIMARY KEY,
+    tenant_id bigint NOT NULL,
+    user_id bigint NOT NULL,
+    role TEXT[] NOT NULL DEFAULT ARRAY['member'],
+    balance numeric(20, 8) NOT NULL DEFAULT 0,
+    status varchar(50) NOT NULL DEFAULT 'active',
+    created_at timestamptz NOT NULL DEFAULT NOW(),
+    updated_at timestamptz NOT NULL DEFAULT NOW(),
+    UNIQUE (tenant_id, user_id)
+);
+
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+DROP TABLE IF EXISTS tenant_users;
+
+-- +goose StatementEnd