fix: tighten v2 setup and release safeguards (#6824)

.env.example

@@ -16,9 +16,10 @@ LOG_LEVEL='info'
 
 # This is how you can use the sqlite driver:
 DB_DRIVER='better-sqlite3'
-# Safe local source-development path. SQLite files are ignored by Git.
+# Set an absolute writable SQLite path so migrations and the app use the same file.
+# Their working directories differ; do not use a relative path here.
 # Container images use /appdata/db/db.sqlite by default instead.
-DB_URL='./db.sqlite'
+DB_URL=
 
 # Those are the two ways to use the mysql2 driver:
 # 1. Using the URL format: