Module replication 

Replication and high availability support.

This module provides types for managing database replication, read replicas, connection routing, and failover handling.

Database Support

Feature	PostgreSQL	MySQL	SQLite	MSSQL	MongoDB
Read replicas	✅	✅	❌	✅ Always	✅ Replica
Logical replication	✅	✅	❌	✅	✅
Connection routing	✅	✅	❌	✅	✅
Auto-failover	✅	✅	❌	✅	✅
Read preference	❌	❌	❌	❌	✅

Modules

lag_queries

SQL queries for checking replication lag.

mongodb

MongoDB-specific replication types.

Structs

ConnectionRouter

Connection router for read/write splitting.

LagMeasurement

Lag measurement for a replica.

LagMonitor

Monitor for tracking replication lag.

ReplicaConfig

Configuration for a database replica.

ReplicaHealth

Health information for a replica.

ReplicaSetBuilder

Builder for replica set configuration.

ReplicaSetConfig

Configuration for a replica set.

Enums

HealthStatus

Health status of a replica.

QueryType

Query type for routing decisions.

ReadPreference

Read preference for query routing.

ReplicaRole

Role of a replica in the cluster.