feat: add session max lifetime and fix refresh logic (#559)

* feat: allow any HTTP method for /api/auth/envoy and restrict methods for non-envoy proxies

* feat: add Allow header for invalid methods in proxyHandler

* feat: add session max lifetime and fix refresh logic

* fix: set default value for created_at column and improve session expiration logic

---------

Co-authored-by: Stavros <steveiliop56@gmail.com>

internal/bootstrap/db_bootstrap.go

@@ -27,6 +27,10 @@ func (app *BootstrapApp) SetupDatabase(databasePath string) (*sql.DB, error) {
 		return nil, fmt.Errorf("failed to open database: %w", err)
 	}
 
+	// Limit to 1 connection to sequence writes, this may need to be revisited in the future
+	// if the sqlite connection starts being a bottleneck
+	db.SetMaxOpenConns(1)
+
 	migrations, err := iofs.New(assets.Migrations, "migrations")
 
 	if err != nil {