feat: add support for deleting a single message

Author: juntae6942

memory/repository/spring-ai-model-chat-memory-repository-jdbc/src/main/java/org/springframework/ai/chat/memory/repository/jdbc/HsqldbChatMemoryRepositoryDialect.java

@@ -41,4 +41,9 @@ public String getSelectConversationIdsSql() {
 		return "SELECT DISTINCT conversation_id FROM SPRING_AI_CHAT_MEMORY";
 	}
 
+	@Override
+	public String getDeleteMessageSql() {
+		return "DELETE FROM SPRING_AI_CHAT_MEMORY WHERE conversation_id = ? AND content = ? AND type = ?";
+	}
+
 }

memory/repository/spring-ai-model-chat-memory-repository-jdbc/src/main/java/org/springframework/ai/chat/memory/repository/jdbc/JdbcChatMemoryRepositoryDialect.java

@@ -45,6 +45,11 @@ public interface JdbcChatMemoryRepositoryDialect {
 	 */
 	String getDeleteMessagesSql();
 
+	/**
+	 * Returns the SQL to delete a single message for a conversation.
+	 */
+	String getDeleteMessageSql();
+
 	/**
 	 * Optionally, dialect can provide more advanced SQL as needed.
 	 */

memory/repository/spring-ai-model-chat-memory-repository-jdbc/src/main/java/org/springframework/ai/chat/memory/repository/jdbc/PostgresChatMemoryRepositoryDialect.java

@@ -44,4 +44,9 @@ public String getDeleteMessagesSql() {
 		return "DELETE FROM SPRING_AI_CHAT_MEMORY WHERE conversation_id = ?";
 	}
 
+	@Override
+	public String getDeleteMessageSql() {
+		return "DELETE FROM SPRING_AI_CHAT_MEMORY WHERE conversation_id = ? AND content = ? AND type = ?";
+	}
+
 }

memory/repository/spring-ai-model-chat-memory-repository-jdbc/src/main/java/org/springframework/ai/chat/memory/repository/jdbc/SqlServerChatMemoryRepositoryDialect.java

@@ -44,4 +44,9 @@ public String getDeleteMessagesSql() {
 		return "DELETE FROM SPRING_AI_CHAT_MEMORY WHERE conversation_id = ?";
 	}
 
+	@Override
+	public String getDeleteMessageSql() {
+		return "DELETE FROM SPRING_AI_CHAT_MEMORY WHERE conversation_id = ? AND content = ? AND type = ?";
+	}
+
 }