feat: add per-user tenant scoping

schema/core.dbml

@@ -6,16 +6,28 @@ Table thoughts {
   created_at timestamptz [default: `now()`]
   updated_at timestamptz [default: `now()`]
   project_id bigint [ref: > projects.id]
+  tenant_key text
   archived_at timestamptz
+
+  indexes {
+    tenant_key
+    (tenant_key, project_id)
+  }
 }
 
 Table projects {
   id bigserial [pk]
   guid uuid [unique, not null, default: `gen_random_uuid()`]
-  name text [unique, not null]
+  name text [not null]
   description text
+  tenant_key text
   created_at timestamptz [default: `now()`]
   last_active_at timestamptz [default: `now()`]
+
+  indexes {
+    (tenant_key, name) [unique]
+    tenant_key
+  }
 }
 
 Table thought_links {