docs: move security guidance to SECURITY.md

README.md

@@ -265,26 +265,6 @@ Run `pg-r2-backup schedule` at any time to see scheduling examples.
 
 ---
 
-## 🔐 Security
-
-- **Do not expose PostgreSQL directly to the public internet.**  
-  If your database is not on a private network, use a secure tunnel instead.
-
-- **Recommended: Cloudflare Tunnel**  
-  When using a public database URL, it is strongly recommended to connect via a secure tunnel such as **Cloudflare Tunnel** rather than opening database ports.
-
-- **Protect credentials**  
-  Store all secrets (database URLs, R2 keys, encryption passwords) using environment variables.  
-  Never commit `.env` files to version control.
-
-- **Encrypted backups (optional)**  
-  Set `BACKUP_PASSWORD` to enable encrypted backups using 7z before uploading to S3-compatible storage.
-
-- **Least privilege access**  
-  Use a PostgreSQL user with read-only access where possible, and restrict R2 credentials to the required bucket only.
-
----
-
 ## 🛠 Development & Contributions
 
 Fork this repository **only if you plan to**:
@@ -296,6 +276,8 @@ Fork this repository **only if you plan to**:
 
 ---
 
+## For security best practices and deployment recommendations, see [SECURITY.md](SECURITY.md).
+
 ## ❓ FAQ
 
 **Why only DATABASE_URL?**  

SECURITY.md

@@ -0,0 +1,48 @@
+# 🔐 Security Policy
+
+## Database Exposure
+
+This project does **not** require PostgreSQL to be exposed to the public internet.
+
+- Never open PostgreSQL port `5432` directly without strict firewall rules.
+- Prefer private networking whenever possible.
+
+## Managed Databases
+
+Managed PostgreSQL providers (e.g. Supabase, Neon, AWS RDS, Google Cloud SQL)
+use public hostnames but secure connections via TLS, authentication, and network controls.
+These are safe to use without any tunnel.
+
+## Self-hosted Databases
+
+If you run PostgreSQL on your own server and cannot place it on a private network,
+use a secure tunnel such as:
+- Cloudflare Tunnel
+- SSH tunneling
+- VPN (WireGuard, Tailscale, etc.)
+
+Do **not** expose database ports directly to the internet.
+
+## Credentials & Secrets
+
+- Store all secrets (database URLs, R2 access keys, encryption passwords)
+  in environment variables.
+- Never commit `.env` files or credentials to version control.
+
+## Encrypted Backups (Optional)
+
+Set `BACKUP_PASSWORD` to enable encrypted backups before uploading
+to S3-compatible storage.
+
+## Least Privilege
+
+- Use a PostgreSQL user with read-only permissions where possible.
+- Restrict Cloudflare R2 credentials to the required bucket only.
+
+## Reporting Security Issues
+
+If you discover a security vulnerability, please report it responsibly.
+Do **not** open a public issue with sensitive details.
+
+> This document describes recommended security practices; exact requirements depend on your deployment environment.
+