chore: update docs

Author: damlayildiz

docs/postgresql/SELF_HOSTING_POSTGRES_FLYIO.md

@@ -258,16 +258,13 @@ const http = require("http");
 const jwt = require("jsonwebtoken");
 
 const PORT = process.env.PORT || 3001;
-const JWT_SECRET_RAW = process.env.JWT_SECRET;
+const JWT_SECRET = process.env.JWT_SECRET;
 
-if (!JWT_SECRET_RAW) {
+if (!JWT_SECRET) {
   console.error("JWT_SECRET environment variable is required");
   process.exit(1);
 }
 
-// Decode base64 secret to raw bytes — must match how CloudSync verifies tokens
-const JWT_SECRET = Buffer.from(JWT_SECRET_RAW, "base64");
-
 function parseBody(req) {
   return new Promise((resolve, reject) => {
     let data = "";
@@ -627,7 +624,7 @@ JWT_SECRET=<your-jwt-secret>
 JWT_DEVELOPMENT_ISSUER_PROJECT_ID=cloudsync-postgres-flyio
 ```
 
-Both the auth server and CloudSync must decode the base64 secret to the same raw bytes before signing/verifying.
+Both the auth server and CloudSync must use the secret as the same raw string (not base64-decoded).
 
 ### Option B: RS256 (JWKS)
 
@@ -752,7 +749,7 @@ docker compose logs -f auth   # Auth server only
 | `fractional_indexing.h: No such file or directory` | Run `git submodule update --init --recursive` before building |
 | `cloudsync_version()` not found | Init scripts only run on first start. Run `CREATE EXTENSION IF NOT EXISTS cloudsync;` manually |
 | Auth server won't start | Check `docker compose logs auth`. Ensure `npm install` was run in `auth-server/` |
-| Token verification fails (HS256) | Ensure `JWT_SECRET` matches and both sides base64-decode it before use |
+| Token verification fails (HS256) | Ensure `JWT_SECRET` matches exactly — CloudSync uses the raw string, not base64-decoded |
 | Token verification fails (JWKS) | Ensure CloudSync can reach the JWKS endpoint and `JWT_ISSUER` matches the `ISSUER` env var |
 | JWKS keys lost after restart | The JWKS server generates new keys on each start. For production, persist keys to a volume |
 | Docker commands not found after VM restart | Run `/data/startup.sh` — Fly VM root filesystem resets on stop/start |