feat(tenant): delegate tenant configuration (#280)

so we can have meetings shared between domains

Author: stakach

migration/db/migrations/202501211046000_alter_tenant_add_parent.sql

@@ -0,0 +1,18 @@
+-- +micrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+
+ALTER TABLE tenants ADD COLUMN parent_id BIGINT DEFAULT NULL;
+
+ALTER TABLE tenants ADD CONSTRAINT fk_tenants_parent_id
+    FOREIGN KEY (parent_id) 
+    REFERENCES tenants(id)
+    ON DELETE CASCADE;
+
+CREATE INDEX IF NOT EXISTS index_tenants_parent_id_idx ON "tenants" USING HASH (parent_id);
+
+-- +micrate Down
+-- SQL section 'Down' is executed when this migration is rolled back
+
+ALTER TABLE tenants DROP CONSTRAINT fk_tenants_parent_id;
+DROP INDEX IF EXISTS index_tenants_parent_id_idx;
+ALTER TABLE tenants DROP COLUMN parent_id;

src/placeos-models/tenant.cr

@@ -9,6 +9,8 @@ module PlaceOS::Model
   class Tenant < ModelWithAutoKey
     table :tenants
 
+    belongs_to Tenant, foreign_key: "parent_id", association_name: "parent"
+
     attribute name : String?
     attribute domain : String
     attribute email_domain : String? = nil