diff --git a/src/main/java/kst4contest/controller/ChatController.java b/src/main/java/kst4contest/controller/ChatController.java
index dfe9fa17..6e9d0bcd 100644
--- a/src/main/java/kst4contest/controller/ChatController.java
+++ b/src/main/java/kst4contest/controller/ChatController.java
@@ -2866,9 +2866,35 @@ private ObservableList<String>
 	 * @param setOwnChatMemberObject
 	 */
 	public ChatController(ChatMember setOwnChatMemberObject,StatusUpdateListener listener) {
+		this(setOwnChatMemberObject,
+				listener,
+				ChatPreferences.PREFERENCES_FILE,
+				DBController.DATABASE_FILE,
+				true);
+	}
+
+	/**
+	 * Creates a chat controller bound to the files of one operator profile.
+	 *
+	 * <p>Both file names are resolved below the application directory. This is the only
+	 * place where the active operator profile enters the controller; everything below
+	 * works on the resulting {@link ChatPreferences} and {@link DBController} instances
+	 * without knowing about profiles at all.</p>
+	 *
+	 * @param setOwnChatMemberObject          chat member object representing the local station
+	 * @param listener                        callback for thread status updates
+	 * @param preferencesRelativeFileName     preferences file name relative to the application directory
+	 * @param workedDatabaseRelativeFileName  worked-station database file name relative to the application directory
+	 * @param seedWorkedDatabaseFromResource  true to seed a missing database from the bundled template
+	 */
+	public ChatController(ChatMember setOwnChatMemberObject,
+			StatusUpdateListener listener,
+			String preferencesRelativeFileName,
+			String workedDatabaseRelativeFileName,
+			boolean seedWorkedDatabaseFromResource) {
 		super();
 
-        chatPreferences = new ChatPreferences();
+        chatPreferences = new ChatPreferences(preferencesRelativeFileName);
         chatPreferences.readPreferencesFromXmlFile();
 //        this.statusListener = listener;
 		lstNotify_QSOSniffer_sniffedCallSignList =
@@ -2930,7 +2956,7 @@ private ObservableList<String>
 			}
 		});
 
-		dbHandler = new DBController();
+		dbHandler = new DBController(workedDatabaseRelativeFileName, seedWorkedDatabaseFromResource);
 		reachabilityService = new ReachabilityService(this);
 		rebuildWorkedGrossFieldCacheFromDatabase();
 
diff --git a/src/main/java/kst4contest/model/ChatPreferences.java b/src/main/java/kst4contest/model/ChatPreferences.java
index 5bcf7ad5..f07015ef 100644
--- a/src/main/java/kst4contest/model/ChatPreferences.java
+++ b/src/main/java/kst4contest/model/ChatPreferences.java
@@ -79,7 +79,26 @@ public class ChatPreferences {
 	 * TODO: delete this from the kst4contest.view/Main.java!
 	 */
 	public ChatPreferences() {
-		ApplicationFileUtils.copyResourceIfRequired(ApplicationConstants.APPLICATION_NAME, PREFERENCE_RESOURCE, PREFERENCES_FILE);
+		this(PREFERENCES_FILE);
+	}
+
+	/**
+	 * Creates preferences bound to one operator profile.
+	 *
+	 * <p>The file name is resolved below the application directory, so both
+	 * "preferences.xml" for the root installation and "profiles/OP2/preferences.xml"
+	 * for an additional operator profile are valid. A missing file is seeded from the
+	 * bundled template, which gives a new profile the same clean defaults a first-ever
+	 * installation gets.</p>
+	 *
+	 * @param applicationRelativeFileName preferences file name relative to the application directory
+	 */
+	public ChatPreferences(final String applicationRelativeFileName) {
+		ApplicationFileUtils.copyResourceIfRequired(ApplicationConstants.APPLICATION_NAME, PREFERENCE_RESOURCE, applicationRelativeFileName);
+		this.storeAndRestorePreferencesFileName = ApplicationFileUtils.getFilePath(
+				ApplicationConstants.APPLICATION_NAME,
+				applicationRelativeFileName
+		);
 
 //        lstNotify_QSOSniffer_sniffedCallSignList.add("DF0GEB");