The Bolty pool the data layer should use for the current process.

Defaults to the primary Bolt pool. Override per-process with with_pool/2 (or by setting :ash_neo4j_pool in the process dictionary) — used to route a test's queries and capability checks to a different Neo4j server (e.g. the Bolt 6.0 / Cypher 25 pool).

Returns true when the current pool (see current_pool/0) is connected to a Neo4j server that supports Cypher 25 (date-versioned Neo4j ≥ 2025.06).

Derived from the server_version string in Bolty.connection_info/1 and cached per pool in :persistent_term. Once diffo-dev/bolty#47 lands this can be simplified to reading policy().cypher25 directly.

Cypher 25 support for an explicit pool.

Checks Bolty connectivity

Returns the negotiated %Bolty.Policy{} for the current pool (see current_pool/0), or nil when that pool is not started. Cached per pool in :persistent_term after the first call.

Returns the %Bolty.Policy{} for an explicit pool, or nil when not started.

Starts Bolty, returns :ok or {:error, error}

Starts Bolty with config, returns :ok or {:error, error}

Starts the Bolt6 pool (Neo4j 2026.05, Bolt 6.0). Returns :ok, {:error, error}, or {:error, :not_configured} when no Bolt6 config is present.

Runs fun with the data-layer pool overridden to pool for the current process, restoring the previous value afterwards. Query execution and the policy/0 / cypher25?/0 capability checks all follow the override.