Introduce chat database integration with message persistence and initialization.

backend/src/main/java/com/alttd/altitudeweb/controllers/chat/ChatController.java

@@ -21,7 +21,6 @@ public class ChatController implements ChatApi {
 
     @Override
     public ResponseEntity<Void> sendChatMessages(List<ChatMessageDto> chatMessageDtoList) {
-        //TODO [Admin] [2026-07-18]: Implement handling chat messages (push to listeners)
         chatMessageDtoList.stream().map(ChatMessageMapper::fromDto).forEach(chatService::addChatMessage);
         return new ResponseEntity<>(HttpStatus.ACCEPTED);
     }

backend/src/main/java/com/alttd/altitudeweb/controllers/chat/ChatMessageMapper.java

@@ -1,8 +1,12 @@
 package com.alttd.altitudeweb.controllers.chat;
 
+import com.alttd.altitudeweb.database.chat.ChatLogDao;
 import com.alttd.altitudeweb.model.ChatMessageDto;
 import lombok.experimental.UtilityClass;
 
+import java.time.Instant;
+import java.util.UUID;
+
 @UtilityClass
 public class ChatMessageMapper {
 
@@ -16,4 +20,14 @@ public class ChatMessageMapper {
                 .build();
     }
 
+    public ChatMessage fromDao(ChatLogDao dao) {
+        return ChatMessage.builder()
+                .uuid(UUID.fromString(dao.getUuid()))
+                .timestamp(Instant.ofEpochMilli(dao.getTimeStamp()))
+                .server(dao.getServer())
+                .messageJson(dao.getMiniMessage())
+                .blocked(dao.isBlocked())
+                .build();
+    }
+
 }

backend/src/main/java/com/alttd/altitudeweb/services/chat/ChatService.java

@@ -1,7 +1,15 @@
 package com.alttd.altitudeweb.services.chat;
 
 import com.alttd.altitudeweb.controllers.chat.ChatMessage;
+import com.alttd.altitudeweb.controllers.chat.ChatMessageMapper;
+import com.alttd.altitudeweb.database.Databases;
+import com.alttd.altitudeweb.database.chat.ChatLogDao;
+import com.alttd.altitudeweb.database.chat.ChatLogMapper;
+import com.alttd.altitudeweb.database.litebans.HistoryCountMapper;
+import com.alttd.altitudeweb.setup.Connection;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.event.EventListener;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 
@@ -27,6 +35,22 @@ public class ChatService {
                 currentSize - chatMessages.size(), currentSize);
     }
 
+    @EventListener(ApplicationReadyEvent.class)
+    public void loadMessagesFromDb() {
+        Connection.getConnection(Databases.CHAT)
+                .runQuery(sqlSession -> {
+                    log.debug("Loading uuid search result count");
+                    try {
+                        sqlSession.getMapper(ChatLogMapper.class)
+                                .getChatLogs(Instant.now().minus(Duration.ofHours(1)).toEpochMilli())
+                                .stream().map(ChatMessageMapper::fromDao)
+                                .forEach(this::addChatMessage);
+                    } catch (Exception e) {
+                        log.error("Failed to load history count", e);
+                    }
+                });
+    }
+
     public void addChatMessage(ChatMessage chatMessage) {
         //TODO [Stijn] [2026-07-18]: remove log info after verifying it works
         log.info("Adding chat message: {}", chatMessage);