Initial commit: Portfolio Website
Vollständige Next.js 15 Portfolio-Website mit: - Blog-System mit 100+ Artikeln - Supabase-Integration - Responsive Design mit Tailwind CSS - TypeScript-Konfiguration - Testing-Setup mit Vitest und Playwright Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Claude Opus 4.5
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import { query, queryOne } from './postgres';
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// Type definitions for chat tables
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export type ChatRole = 'user' | 'assistant' | 'system';
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export interface ChatSession {
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id: string;
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created_at: string;
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updated_at: string;
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visitor_id: string;
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metadata: Record<string, unknown>;
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}
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export interface ChatMessage {
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id: string;
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session_id: string;
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role: ChatRole;
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content: string;
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created_at: string;
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}
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// Input types for creating records
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export interface CreateChatSessionInput {
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visitor_id: string;
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metadata?: Record<string, unknown>;
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}
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export interface CreateChatMessageInput {
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session_id: string;
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role: ChatRole;
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content: string;
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}
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// ============================================
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// Chat Session Operations
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// ============================================
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/**
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* Create a new chat session for a visitor
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*/
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export async function createChatSession(
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input: CreateChatSessionInput
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): Promise<ChatSession> {
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const result = await queryOne<ChatSession>(
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`INSERT INTO chat_sessions (visitor_id, metadata)
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VALUES ($1, $2)
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RETURNING *`,
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[input.visitor_id, JSON.stringify(input.metadata ?? {})]
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);
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if (!result) {
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throw new Error('Failed to create chat session');
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}
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return result;
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}
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/**
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* Get a chat session by ID
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*/
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export async function getChatSession(
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sessionId: string
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): Promise<ChatSession | null> {
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return queryOne<ChatSession>(
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'SELECT * FROM chat_sessions WHERE id = $1',
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[sessionId]
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);
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}
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/**
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* Get or create a chat session for a visitor
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* Useful for maintaining session continuity
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*/
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export async function getOrCreateChatSession(
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visitorId: string,
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metadata?: Record<string, unknown>
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): Promise<ChatSession> {
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// First, try to find an existing active session for this visitor
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// Get the most recent session from the last 24 hours
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const existingSession = await queryOne<ChatSession>(
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`SELECT * FROM chat_sessions
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WHERE visitor_id = $1
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AND created_at >= NOW() - INTERVAL '24 hours'
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ORDER BY created_at DESC
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LIMIT 1`,
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[visitorId]
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);
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if (existingSession) {
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return existingSession;
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}
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// No existing session found, create a new one
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return createChatSession({
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visitor_id: visitorId,
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metadata,
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});
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}
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/**
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* Update session metadata
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*/
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export async function updateSessionMetadata(
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sessionId: string,
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metadata: Record<string, unknown>
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): Promise<ChatSession> {
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const result = await queryOne<ChatSession>(
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`UPDATE chat_sessions
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SET metadata = $1
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WHERE id = $2
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RETURNING *`,
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[JSON.stringify(metadata), sessionId]
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);
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if (!result) {
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throw new Error('Failed to update session metadata');
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}
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return result;
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}
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// ============================================
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// Chat Message Operations
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// ============================================
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/**
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* Add a message to a chat session
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*/
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export async function addChatMessage(
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input: CreateChatMessageInput
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): Promise<ChatMessage> {
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const result = await queryOne<ChatMessage>(
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`INSERT INTO chat_messages (session_id, role, content)
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VALUES ($1, $2, $3)
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RETURNING *`,
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[input.session_id, input.role, input.content]
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);
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if (!result) {
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throw new Error('Failed to add chat message');
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}
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return result;
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}
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/**
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* Get all messages for a chat session
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* Returns messages in chronological order
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*/
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export async function getChatMessages(
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sessionId: string
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): Promise<ChatMessage[]> {
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return query<ChatMessage>(
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`SELECT * FROM chat_messages
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WHERE session_id = $1
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ORDER BY created_at ASC`,
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[sessionId]
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);
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}
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/**
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* Get the last N messages for a session
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* Useful for maintaining context window limits
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*/
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export async function getRecentMessages(
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sessionId: string,
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limit: number = 20
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): Promise<ChatMessage[]> {
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const messages = await query<ChatMessage>(
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`SELECT * FROM chat_messages
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WHERE session_id = $1
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ORDER BY created_at DESC
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LIMIT $2`,
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[sessionId, limit]
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);
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// Reverse to get chronological order
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return messages.reverse();
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}
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/**
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* Delete all messages for a session (clear history)
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*/
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export async function clearChatMessages(sessionId: string): Promise<void> {
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await query(
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'DELETE FROM chat_messages WHERE session_id = $1',
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[sessionId]
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);
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}
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/**
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* Delete a chat session and all its messages
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* Messages are deleted automatically via ON DELETE CASCADE
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*/
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export async function deleteChatSession(sessionId: string): Promise<void> {
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await query(
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'DELETE FROM chat_sessions WHERE id = $1',
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[sessionId]
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);
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}
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// ============================================
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// Utility Functions
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// ============================================
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/**
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* Get conversation history formatted for AI context
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* Converts database messages to the format expected by chat completion APIs
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*/
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export async function getConversationHistory(
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sessionId: string,
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maxMessages: number = 20
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): Promise<Array<{ role: ChatRole; content: string }>> {
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const messages = await getRecentMessages(sessionId, maxMessages);
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return messages.map((msg) => ({
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role: msg.role,
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content: msg.content,
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}));
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}
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/**
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* Save a conversation turn (user message + assistant response)
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* Convenience function for typical chat flow
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*/
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export async function saveConversationTurn(
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sessionId: string,
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userMessage: string,
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assistantResponse: string
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): Promise<{ userMsg: ChatMessage; assistantMsg: ChatMessage }> {
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const userMsg = await addChatMessage({
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session_id: sessionId,
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role: 'user',
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content: userMessage,
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});
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const assistantMsg = await addChatMessage({
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session_id: sessionId,
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role: 'assistant',
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content: assistantResponse,
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});
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return { userMsg, assistantMsg };
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}
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// Default export for convenience
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export default {
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// Session operations
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createChatSession,
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getChatSession,
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getOrCreateChatSession,
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updateSessionMetadata,
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deleteChatSession,
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// Message operations
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addChatMessage,
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getChatMessages,
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getRecentMessages,
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clearChatMessages,
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// Utility functions
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getConversationHistory,
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saveConversationTurn,
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};
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