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Configuration

All configuration is via environment variables.

Required

Variable	Description
`DATABASE_URL`	PostgreSQL connection string
`HOST_URL`	Public URL for webhook callbacks (must start with `http://` or `https://`)

Optional

Variable	Default	Description
`PORT`	`8085`	Server port
`RUST_LOG`	`info`	Log level

Connection Pool

Variable	Default	Description
`POOL_MAX_SIZE`	`10`	Maximum connections
`POOL_MIN_IDLE`	`5`	Minimum idle connections
`POOL_ACQUIRE_RETRIES`	`3`	Connection acquire retries
`POOL_TIMEOUT_SECS`	`30`	Connection timeout in seconds

Pagination

Variable	Default	Description
`PAGINATION_DEFAULT`	`50`	Default items per page
`PAGINATION_MAX`	`100`	Maximum items per page

Worker

Variable	Default	Description
`WORKER_LOOP_INTERVAL_MS`	`1000`	Worker loop interval in ms
`WORKER_CLAIM_TIMEOUT_SECS`	`30`	Max time a task can stay Claimed before requeue
`BATCH_CHANNEL_CAPACITY`	`100`	Batch update channel size

Circuit Breaker

Variable	Default	Description
`CIRCUIT_BREAKER_ENABLED`	`1`	Enable circuit breaker (0 to disable)
`CIRCUIT_BREAKER_FAILURE_THRESHOLD`	`5`	Failures before circuit opens
`CIRCUIT_BREAKER_FAILURE_WINDOW_SECS`	`10`	Time window for counting failures
`CIRCUIT_BREAKER_RECOVERY_TIMEOUT_SECS`	`30`	Time before trying half-open
`CIRCUIT_BREAKER_SUCCESS_THRESHOLD`	`2`	Successes in half-open to close

Observability

Variable	Default	Description
`SLOW_QUERY_THRESHOLD_MS`	`100`	Slow query warning threshold in ms
`TRACING_ENABLED`	`0`	Enable OpenTelemetry distributed tracing
`OTEL_EXPORTER_OTLP_ENDPOINT`	-	OTLP endpoint URL (e.g., `http://localhost:4317`)
`OTEL_SERVICE_NAME`	`arcrun`	Service name for traces
`OTEL_SAMPLING_RATIO`	`1.0`	Sampling ratio (0.0 to 1.0)

Retention

Variable	Default	Description
`RETENTION_ENABLED`	`0`	Enable automatic cleanup of old terminal tasks
`RETENTION_DAYS`	`30`	Number of days to retain terminal tasks before cleanup
`RETENTION_CLEANUP_INTERVAL_SECS`	`3600`	Interval between cleanup runs in seconds
`RETENTION_BATCH_SIZE`	`1000`	Number of tasks to delete per cleanup run

Security

Variable	Default	Description
`SKIP_SSRF_VALIDATION`	`1` (debug) / `0` (release)	Skip SSRF validation on webhook URLs
`BLOCKED_HOSTNAMES`	`localhost,127.0.0.1,::1,0.0.0.0,local,internal`	Comma-separated blocked hostnames
`BLOCKED_HOSTNAME_SUFFIXES`	`.local,.internal,.localdomain,.localhost`	Comma-separated blocked hostname suffixes