Updated the ConfigReader+Properties extension in the Website service target to fail to the boot in case of unknown database tokens.

Services/Website/Sources/App/Extensions/App+Build.swift

@@ -16,7 +16,8 @@ import WebsiteLibrary
 /// band (so a shared database is never migrated on boot).
 /// - Parameter reader: the configuration reader the values are read from.
 /// - Returns: the configured application, ready to run as a service.
-/// - Throws: an error when the persistence service cannot be built (e.g. its TLS context fails to build).
+/// - Throws: a ``ConfigError`` when a `database.*` key holds an unrecognized token, or an error when the persistence service cannot be built
+///   (e.g. its TLS context fails to build).
 func application(
     reader: ConfigReader
 ) async throws -> some ApplicationProtocol {
@@ -34,8 +35,9 @@ func application(
         logger.warning("String Catalog is \(isCatalogMissing ? "missing" : "undecodable"); pages will serve raw localization keys")
     }
 
+    let driver = try reader.driver
     let persistence = try Service(
-        driver: reader.driver,
+        driver: driver,
         logger: logger
     )
     let fluent = persistence()
@@ -68,7 +70,7 @@ func application(
 
     // The in-memory backend is recreated on every launch, so it is migrated on startup. The PostgreSQL backend is
     // left untouched here: a shared database is migrated out of band to avoid multi-instance races.
-    if case .inMemory = reader.driver {
+    if case .inMemory = driver {
         app.beforeServerStarts {
             try await fluent.migrate()
         }
@@ -91,7 +93,7 @@ func migration(
         logLevel: reader.logLevel
     )
     let service = try Service(
-        driver: reader.driver,
+        driver: try reader.driver,
         logger: logger
     )