Started work on permissions

sql/get_all_permissions_for_folder.sql

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+SELECT
+    username,
+    permission_type as "permission_type: PermissionRaw"
+FROM
+    permissions
+    INNER JOIN users ON permissions.user_id = users.user_id
+WHERE
+    folder_id = $1

sql/get_permissions_for_folder.sql

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+SELECT
+    permission_type as "permission_type: PermissionRaw"
+FROM
+    permissions
+WHERE
+    folder_id = $1
+    AND user_id = $2
+UNION
+SELECT
+    'manage' as "permission_type: PermissionRaw"
+FROM
+    folders
+WHERE
+    folder_id = $1
+    AND owner_id = $2

sql/insert_permission.sql

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+WITH RECURSIVE folder_hierarchy AS (
+    -- Start with the given directory
+    SELECT 
+        folder_id 
+    FROM 
+        folders 
+    WHERE 
+        folder_id = $1
+
+    UNION ALL
+
+    -- Recursively find all subdirectories
+    SELECT 
+        f.folder_id
+    FROM 
+        folders f
+    INNER JOIN 
+        folder_hierarchy fh ON f.parent_folder_id = fh.folder_id
+)
+INSERT INTO permissions(user_id, folder_id, permission_type)
+SELECT $2::integer as user_id, fh.folder_id::UUID as folder_id, $3
+FROM folder_hierarchy fh
+ON CONFLICT (user_id, folder_id) DO UPDATE
+SET permission_type = $3