Fastify
06 Persistence
Persist Fastify chat history through your app storage.
Fastify gives you routing and lifecycle hooks. Your app owns session storage and message persistence.
1. Load Existing Messages
const session = await db.chatSession.findUnique({
where: { id: request.params.sessionId, userId: request.user.id },
include: { messages: { orderBy: { createdAt: "asc" } } },
});
if (!session) {
return reply.status(404).send({ error: { code: "not_found" } });
}2. Send With History
const response = await supportAgent
.prompt(message)
.messages(session.messages.map((item) => item.message))
.send();3. Store New Messages
await db.chatMessage.createMany({
data: response.messages.map((message) => ({
sessionId: session.id,
message,
})),
});Store messages only after the run succeeds. Use a transaction when message writes must commit with application state changes.
4. Use Memory When The Model Should Remember
Use chat history for conversation continuity. Use Anvia memory for durable facts that should be recalled across future runs.
Next
Prepare runtime constraints in Deploy. Related guides: Memory, Memory and Sessions, and Agent History.