`nexyron.feature_serve_many`

Generic Description

nexyron.feature_serve_many serve multiple subject feature maps from one snapshot contract, optionally reusing a matching materialized snapshot

CALL nexyron.procedures()
YIELD name, description, parameters, output_columns
WHERE name = 'nexyron.feature_serve_many'
RETURN name, description, parameters, output_columns

Abstraction-platform registry procedures create, list, read, and inspect named contracts such as abstractions, features, datasets, snapshots, models, policies, interventions, scenarios, and split policies.

Consumer-Level Explanation

This procedure belongs to the model and feature-serving runtime. Use it when you need feature resolution, scoring, explanation, evaluation, or model-quality analysis from already registered abstraction contracts.

Parameters

• snapshot: Snapshot definition name Required.
• subject_ids: Requested subject identifiers Required.
• at: Optional as-of timestamp in epoch milliseconds for contextual query placeholders Optional.
• system_at: Optional system-time cutoff in epoch milliseconds for dual-time contextual query placeholders Optional.
• prefer_materialized: When true, reuse a matching materialized snapshot before computing on demand Optional.

Output Columns

• subject_id
• snapshot_ts
• features
• source

Example Contract Prerequisite

The executable Cypher blocks on this page query nexyron.procedures() so they work in an empty database and stay synchronized with the live procedure registry. A direct CALL nexyron.feature_serve_many(...) requires the named abstraction contracts, artifacts, features, snapshots, datasets, models, or policies referenced by that call to exist first; otherwise the runtime correctly fails with an unknown-contract error rather than inventing state.

Conceptual Explanation

The important thing about nexyron.feature_serve_many is that it stays inside the same Cypher and abstraction-contract runtime as the rest of Nexyron. That means it can compose with named abstractions, time-aware snapshot contracts, document-style payloads, graph-native identity, and later model or policy layers without forcing you to move into a separate tool first.

More Detailed Explanation

In practical queries, start by deciding the row grain you want after the call: one row per node, one row per path, one row per registry object, one row per artifact, or one row per summary. Then keep that grain explicit with YIELD and named projections. That is the difference between a useful planner-facing example and a vague call that downstream tooling cannot safely compose. For contract-driven abstraction procedures, the executable examples on these pages intentionally inspect procedure metadata unless the required named artifacts are created in the same example.

Advanced Example

CALL nexyron.procedures()
YIELD name, parameters, output_columns
WHERE name = 'nexyron.feature_serve_many'
RETURN name,
       [p IN parameters | p.name] AS parameter_names,
       output_columns
ORDER BY name

Real Use Cases

• Register reusable member-retention contracts once, then let snapshots, datasets, models, and policies reference those names instead of duplicating raw Cypher in every workflow.
• Keep admin and product teams aligned around one shared abstraction contract for members, households, facilities, interventions, and churn labels during quarterly retraining cycles.

Real Limitations And Tradeoffs

• This surface is contract-driven. If the registered feature, snapshot, dataset, model, or policy definition is weak, the procedure will faithfully execute that weak contract rather than silently repairing it.
• the procedure fails correctly when required contracts or artifacts do not exist; examples should not imply automatic state creation
• model, policy, and causal outputs are only as defensible as the registered data, temporal, and treatment contracts