Databases

ALTCHA Sentinel supports multiple database backends, allowing it to integrate seamlessly with your existing infrastructure and operational requirements.

Key Capabilities

• Interchangeable database backends
• Automatic database migrations
• Database snapshots and point-in-time recovery
• Cross-backend migration through snapshots
• Support for both single-node and clustered deployments

Supported Databases

Main Database

The main database stores configuration, application data, audit records, and other persistent state.

Backend	Version	Plan
LibSQL	0+	Professional, Enterprise
MariaDB	10.6+	Professional, Enterprise
Microsoft SQL Server	2022+	Enterprise
MySQL	5.6+	Professional, Enterprise
Oracle	21c+	Enterprise
PostgreSQL	15+	Professional, Enterprise
SQLite	—	All
Turbolite	—	Professional, Enterprise

All supported database backends provide automatic schema migrations, snapshots, and point-in-time recovery (PITR).

KV Store (Redis-Compatible)

The KV store is used for shared state, including rate-limiting data, distributed coordination, and pub/sub functionality.

Backend	Version
Redis	7+
Valkey	7+
Built-in KV Store	—

ALTCHA Sentinel uses only the Redis string data type and requires support for the EXPIRE [NX] command (Redis/Valkey 7+). Most Redis-compatible databases should work without modification.

For configuration details, see the Redis documentation.

Logs and Analytics

The logs database stores request logs and powers dashboard analytics.

Backend	Version	Plan
ClickHouse	22.6+	Enterprise

By default, logs are stored in the main database. ClickHouse is an optional backend recommended for large-scale deployments with high log volumes and analytics workloads.