cleaning up npm packages

.env.example

@@ -1,9 +1,18 @@
 # Copy this file to ".env" and fill in real values. Never commit the real .env.
 
 # --- Database ---
-# When running the app OUTSIDE Docker (npm run dev), point this at your Postgres.
-# When running via docker-compose, this is set for you in docker-compose.yml.
-DATABASE_URL=postgres://sde:sde_password@localhost:5432/sde_toolkit
+# Each part of the Postgres connection is its own setting, so the username and
+# password are easy to change. When running via docker-compose these are set for
+# you there; set them here when running the app directly (npm run dev).
+DB_HOST=localhost
+DB_PORT=5432
+DB_USER=sde
+DB_PASSWORD=sde_password
+DB_NAME=sde_toolkit
+
+# Advanced (optional): a full connection string. If set, it overrides the DB_*
+# settings above. Most people should leave this blank and use the DB_* fields.
+# DATABASE_URL=postgres://sde:sde_password@localhost:5432/sde_toolkit
 
 # --- Server ---
 PORT=3000