chatMemory.get(conversationId) returns unexpected timestamp

[ZYMCao]

Spring AI Version: 1.0.0-RC1

chatMemory.get(conversationId) returns

[
{
"messageType": "USER",
"metadata": {
"CassandraChatMemoryRepository_message_timestamp": 1747564565.737000000,
"messageType": "USER"
},
"media": [],
"text": "SSE development using springboot?"
},
{
"messageType": "ASSISTANT",
"metadata": {
"CassandraChatMemoryRepository_message_timestamp": 1747564594.962000000,
"messageType": "ASSISTANT"
},
"toolCalls": [],
"media": [],
"text": "..."
}
]

where

var chatMemory = MessageWindowChatMemory.builder() .chatMemoryRepository(this.cassandraChatMemoryRepository).build();

I did look into ai_chat_memory and found something different. By different I meant values of msg_timestamp have three more digits, similar to:

[{msg_timestamp:1747579713040,msg_type:'USER',msg_content:'Hello'}, {msg_timestamp:1747579718473,msg_type:'ASSISTANT',msg_content:'Hello'}]

@michaelsembwever

[michaelsembwever]

ref: #3097 (comment)

[michaelsembwever]

By default the Instant is serialized as the epoch value (seconds and nanoseconds in a single number).
ref: https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html