Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/045_add_api_key_quota.sql

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+-- Migration: Add quota fields to api_keys table
+-- This migration adds independent quota and expiration support for API keys
+
+-- Add quota limit field (0 = unlimited)
+ALTER TABLE api_keys ADD COLUMN IF NOT EXISTS quota DECIMAL(20, 8) NOT NULL DEFAULT 0;
+
+-- Add used quota amount field
+ALTER TABLE api_keys ADD COLUMN IF NOT EXISTS quota_used DECIMAL(20, 8) NOT NULL DEFAULT 0;
+
+-- Add expiration time field (NULL = never expires)
+ALTER TABLE api_keys ADD COLUMN IF NOT EXISTS expires_at TIMESTAMPTZ;
+
+-- Add indexes for efficient quota queries
+CREATE INDEX IF NOT EXISTS idx_api_keys_quota_quota_used ON api_keys(quota, quota_used) WHERE deleted_at IS NULL;
+CREATE INDEX IF NOT EXISTS idx_api_keys_expires_at ON api_keys(expires_at) WHERE deleted_at IS NULL;
+
+-- Comment on columns for documentation
+COMMENT ON COLUMN api_keys.quota IS 'Quota limit in USD for this API key (0 = unlimited)';
+COMMENT ON COLUMN api_keys.quota_used IS 'Used quota amount in USD';
+COMMENT ON COLUMN api_keys.expires_at IS 'Expiration time for this API key (null = never expires)';