R2_ACCOUNT_ID=
R2_ACCESS_KEY_ID=
R2_SECRET_ACCESS_KEY=
R2_PUBLIC_BUCKET=
R2_PRIVATE_BUCKET=
CACHE_KEY_SECRET=

UPSTASH_REDIS_REST_URL=
UPSTASH_REDIS_REST_TOKEN=
# Choose exactly one generation backend mode: "fastapi" or "next".
# Default to "next" for the simplest local setup and native Copilot SDK execution.
NEXT_PUBLIC_GENERATION_BACKEND=next
# Base URL for generation API (only needed if using fastapi backend).
NEXT_PUBLIC_GENERATE_API_BASE_URL=http://localhost:8000/generate

OPENAI_API_KEY=
AI_PROVIDER=copilot
# OPTIONAL: Choose exactly one provider to use for generation: "copilot", "openai", or "openrouter".
# OPTIONAL: model used for all three generation stages when AI_PROVIDER=openai
OPENAI_MODEL=gpt-5.4-mini
# OPTIONAL: block the default OpenAI key once GitDiagram uses the free daily mini quota
OPENAI_COMPLIMENTARY_GATE_ENABLED=false
OPENAI_COMPLIMENTARY_DAILY_LIMIT_TOKENS=10000000
OPENAI_COMPLIMENTARY_MODEL_FAMILY=gpt-5.4-mini
# OPTIONAL: OpenRouter credentials/model when AI_PROVIDER=openrouter
OPENROUTER_API_KEY=
OPENROUTER_MODEL=openai/gpt-5.4
OPENROUTER_SITE_URL=http://localhost:3000
OPENROUTER_APP_NAME=GitDiagram
NEXT_PUBLIC_POSTHOG_KEY=

# REQUIRED for Copilot Extension: GitHub App token for request verification
# This can be your GitHub Token when running locally, or a GitHub App installation token.
GITHUB_TOKEN=
# OPTIONAL: providing your own GitHub PAT increases rate limits from 60/hr to 5000/hr to the GitHub API
GITHUB_PAT=
# OPTIONAL: GitHub App auth (used when GITHUB_PAT is not provided)
# Either GITHUB_APP_ID or GITHUB_CLIENT_ID can be used as the GitHub App JWT issuer.
GITHUB_APP_ID=
GITHUB_CLIENT_ID=
GITHUB_PRIVATE_KEY=
GITHUB_INSTALLATION_ID=

# OPTIONAL: api-analytics.com key for backend request analytics
API_ANALYTICS_KEY=

# OPTIONAL: comma-separated CORS origins for backend (local + deployed frontend URLs)
CORS_ORIGINS="http://localhost:3000,https://gitdiagram.com,https://www.gitdiagram.com"

# OPTIONAL runtime flags (backend)
ENVIRONMENT=development
HOST=0.0.0.0
PORT=8000
WEB_CONCURRENCY=2