Add folder model

src-tauri/migrations/20231103142807_folders.sql

@@ -0,0 +1,19 @@
+CREATE TABLE folders
+(
+    id            TEXT                               NOT NULL
+        PRIMARY   KEY,
+    model         TEXT     DEFAULT 'folder'          NOT NULL,
+    created_at    DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at    DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    deleted_at    DATETIME,
+    workspace_id  TEXT                               NOT NULL
+        REFERENCES workspaces
+            ON DELETE CASCADE,
+    folder_id     TEXT                               NULL
+        REFERENCES folders
+            ON DELETE CASCADE,
+    name          TEXT                               NOT NULL,
+    sort_priority REAL     DEFAULT 0                 NOT NULL
+);
+
+ALTER TABLE http_requests ADD COLUMN folder_id TEXT REFERENCES folders(id) ON DELETE CASCADE;