Track chat session lifecycles: added session start/end times, database schema, and persistence logic.

database/src/main/java/com/alttd/altitudeweb/setup/InitializeWebDb.java

@@ -4,6 +4,7 @@ import com.alttd.altitudeweb.database.Databases;
 import com.alttd.altitudeweb.database.web_db.KeyPairMapper;
 import com.alttd.altitudeweb.database.web_db.PrivilegedUserMapper;
 import com.alttd.altitudeweb.database.web_db.SettingsMapper;
+import com.alttd.altitudeweb.database.web_db.chat_session.ChatSessionMapper;
 import com.alttd.altitudeweb.database.web_db.forms.AppealMapper;
 import com.alttd.altitudeweb.database.web_db.forms.DiscordAppealMapper;
 import com.alttd.altitudeweb.database.web_db.forms.StaffApplicationMapper;
@@ -28,6 +29,7 @@ public class InitializeWebDb {
                       configuration.addMapper(DiscordAppealMapper.class);
                       configuration.addMapper(StaffApplicationMapper.class);
                       configuration.addMapper(EmailVerificationMapper.class);
+                      configuration.addMapper(ChatSessionMapper.class);
                   }).join()
                   .runQuery(sqlSession -> {
                       createSettingsTable(sqlSession);
@@ -38,6 +40,7 @@ public class InitializeWebDb {
                       createdDiscordAppealTable(sqlSession);
                       createStaffApplicationsTable(sqlSession);
                       createUserEmailsTable(sqlSession);
+                      createChatSessionTable(sqlSession);
                   });
         log.debug("Initialized WebDb");
     }
@@ -208,4 +211,21 @@ public class InitializeWebDb {
         }
     }
 
+    private static void createChatSessionTable(@NotNull SqlSession sqlSession) {
+        String query = """
+                CREATE TABLE IF NOT EXISTS chat_session (
+                    id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                    uuid UUID NOT NULL,
+                    session_start TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
+                    session_end TIMESTAMP NULL,
+                    FOREIGN KEY (uuid) REFERENCES privileged_users(uuid) ON DELETE CASCADE ON UPDATE CASCADE
+                );
+                """;
+        try (Statement statement = sqlSession.getConnection().createStatement()) {
+            statement.execute(query);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
 }