add detach files feature, utf8 filename fix, and error pages

db/init.sql

@@ -59,9 +59,10 @@ CREATE INDEX IF NOT EXISTS idx_group_photos_group_id ON group_photos(group_id);
 
 CREATE TABLE IF NOT EXISTS project_files (
   id SERIAL PRIMARY KEY,
-  entry_id INT NOT NULL REFERENCES entries(id) ON DELETE CASCADE,
+  entry_id INT REFERENCES entries(id) ON DELETE CASCADE,
   token VARCHAR(64) UNIQUE NOT NULL,
   path VARCHAR(255) NOT NULL,
   name VARCHAR(255) NOT NULL,
-  created_at TIMESTAMPTZ DEFAULT now()
+  created_at TIMESTAMPTZ DEFAULT now(),
+  detached_at TIMESTAMPTZ
 );

db/migration.sql

@@ -45,6 +45,9 @@ UPDATE project_files SET token = md5(random()::text || clock_timestamp()::text)
 ALTER TABLE project_files ALTER COLUMN token SET NOT NULL;
 CREATE UNIQUE INDEX IF NOT EXISTS project_files_token_key ON project_files(token);
 
+ALTER TABLE project_files ALTER COLUMN entry_id DROP NOT NULL;
+ALTER TABLE project_files ADD COLUMN IF NOT EXISTS detached_at TIMESTAMPTZ;
+
 ALTER TABLE entries ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;
 
 CREATE TABLE IF NOT EXISTS group_photos (