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>

supabase/migrations/20260125_create_rate_limits_table.sql

@@ -0,0 +1,41 @@
+-- Create rate_limits table for persistent rate limiting
+-- This replaces the in-memory Map-based rate limiter
+
+CREATE TABLE IF NOT EXISTS rate_limits (
+  -- Unique identifier (typically IP address)
+  identifier TEXT NOT NULL,
+
+  -- Number of requests in the current time window
+  count INTEGER NOT NULL DEFAULT 1,
+
+  -- Start of the rate limit window (for sliding window algorithm)
+  window_start TIMESTAMPTZ NOT NULL,
+
+  -- Timestamp when the record was created
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+  -- Timestamp when the record was last updated
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+  -- Primary key ensures one record per identifier per time window
+  PRIMARY KEY (identifier, window_start)
+);
+
+-- Index for fast lookups by identifier and window_start
+-- This is critical for rate limiting performance
+CREATE INDEX IF NOT EXISTS idx_rate_limits_identifier_window
+  ON rate_limits(identifier, window_start DESC);
+
+-- Index for cleanup queries (to remove old rate limit records)
+CREATE INDEX IF NOT EXISTS idx_rate_limits_window_start
+  ON rate_limits(window_start);
+
+-- Add a comment to the table
+COMMENT ON TABLE rate_limits IS 'Stores rate limiting data for API endpoints. Each record tracks request counts within a time window for a specific identifier (typically IP address).';
+
+-- Add comments to columns for documentation
+COMMENT ON COLUMN rate_limits.identifier IS 'Unique identifier for the client (typically IP address)';
+COMMENT ON COLUMN rate_limits.count IS 'Number of requests made in the current time window';
+COMMENT ON COLUMN rate_limits.window_start IS 'Start timestamp of the rate limit window';
+COMMENT ON COLUMN rate_limits.created_at IS 'Timestamp when this record was first created';
+COMMENT ON COLUMN rate_limits.updated_at IS 'Timestamp when this record was last updated';