-- Add rate limiting columns to api_keys table
ALTER TABLE api_keys
    ADD COLUMN IF NOT EXISTS rate_limit_per_minute INT DEFAULT 60,
    ADD COLUMN IF NOT EXISTS rate_limit_per_hour INT DEFAULT 1000;

-- Create rate_limit_state table to track per-key usage windows
CREATE TABLE IF NOT EXISTS rate_limit_state (
    id               SERIAL PRIMARY KEY,
    api_key_id       UUID NOT NULL REFERENCES api_keys(id) ON DELETE CASCADE,
    window_start     TIMESTAMPTZ NOT NULL,
    window_type      VARCHAR(10) NOT NULL, -- 'minute' or 'hour'
    request_count    INT NOT NULL DEFAULT 0,
    created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE (api_key_id, window_start, window_type)
);

-- Index for efficient lookups by api_key_id and window
CREATE INDEX IF NOT EXISTS idx_rate_limit_state_lookup
    ON rate_limit_state(api_key_id, window_type, window_start DESC);

-- Index for cleanup of old entries
CREATE INDEX IF NOT EXISTS idx_rate_limit_state_cleanup
    ON rate_limit_state(window_start);

COMMENT ON TABLE rate_limit_state IS 'Tracks rate limit usage per API key per time window';
COMMENT ON COLUMN rate_limit_state.window_start IS 'Start of the time window (truncated to minute or hour)';
COMMENT ON COLUMN rate_limit_state.window_type IS 'Type of window: minute or hour';
COMMENT ON COLUMN rate_limit_state.request_count IS 'Number of requests in this window';
COMMENT ON COLUMN api_keys.rate_limit_per_minute IS 'Maximum requests allowed per minute (default: 60)';
COMMENT ON COLUMN api_keys.rate_limit_per_hour IS 'Maximum requests allowed per hour (default: 1000)';