Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.6.0] - 2026-08-21

Built-in data-layer capability sets for AshClickhouse.DataLayer, AshScylla.DataLayer, and AshSqlite.DataLayer (AshDyan.DataLayer.Clickhouse, AshDyan.DataLayer.Scylla, AshDyan.DataLayer.Sqlite), alongside the existing Postgres and ETS support.
AshDyan.Charts.to_svg/3 — server-side SVG renderer for AshDyan.Result (AshDyan.Charts.SVG). Produces a standalone <svg> string with no JavaScript or external assets, suitable for emails, PDFs, and non-JS contexts. Supports :bar, :line, :pie, and :doughnut chart types with :width, :height, and :title options; visual conventions match the Chart.js/ECharts adapters.
AshDyan.DataLayer.capabilities/1 and capabilities_for_data_layer/2 — normalized metadata describing a data layer's supported analyses, query primitives (filter, select, limit, timeout, sort), and aggregation strategy (mode, functions). Custom capability modules may implement the optional capabilities/1 callback to advertise native features; omitted sections fall back to conservative defaults.
AshDyan.DataLayer.for_data_layer/1 — resolve the capability module for an explicit data-layer module.

AshDyan.Extension behaviour plus AshDyan.Extension.Loader for formal, composable extensions that register analysis types, data-layer capabilities, custom aggregates, pipeline hooks, and DSL entities without forking.
Pipeline hooks via the AshDyan.Engine.Hook behaviour: before_query, after_query, before_format, after_format stages, runnable from either config :ash_dyan, :hooks or an extension.
New optional AshDyan.Analysis callbacks with default no-op implementations: build_query/2, pre_aggregate/2, post_aggregate/2.
AshDyan.Engine.format/2 — formats records through the analysis module (including pre_aggregate/post_aggregate and presentation post-processing) and runs pipeline hooks. Result.format/2 is now deprecated.
AshDyan.Analysis.Registry.fetch!/1 — raises on an unknown analysis type.
New optional AshDyan.DataLayer callbacks: pushdown_aggregate/3, stream/3, and paginate/3.
Runnable Phoenix + LiveView demo under examples/ash_dyan_demo/ (in-memory data layer, seven live charts) with screenshot in guides/demo_ash_dyan.png.

Analysis.Registry, DataLayer.for_resource/1, and aggregate validation now consult AshDyan.Extension.Loader.load() so extension-registered entries are honored alongside config :ash_dyan, ... (config wins on key conflicts).
AshDyan.Engine.run_query/3 now runs after_query hooks, returns {:ok, records}, and rescues raised errors into {:error, term}.
AshDyan.DataLayer.Simple.supports?/2 gained a catch-all false clause.

Initial release of AshDyan.
dyan DSL extension for declaring analyzable fields on Ash resources.
Domain-level dyan registry via AshDyan.Domain.
Runtime analysis engine (AshDyan.run/1,2) supporting:
- frequency / group-by counts
- numeric aggregates (sum, avg, min, max, count, count_distinct, stddev, variance, median)
- time bucketing
- percentiles
- histograms
In-memory aggregation bounded by max_limit, max_group_by, and query_timeout.
Capability check API (AshDyan.supports?/2) for data-layer limits.
Structured errors via AshDyan.Error with stable reason atoms.
Chart adapter (AshDyan.Charts.to_chartjs/1).
Documentation guides (guides/usage.md, guides/design.md).

Removed the shipped Phoenix/Channel/gen_api adapter modules (AshDyan.Adapters.*). AshDyan is now fully standalone — no plug dependency at compile time. Delivery layers are documented as copy-paste snippets (see README "Building an adapter") rather than versioned APIs.
:sum now rejects nil values before reducing (matching every other aggregate), so a column with a nil no longer raises ArithmeticError.
AshDyan.Engine.apply_filters/2 documents that filters are parsed internally via Ash.Filter.parse/2 (not filter_input) so the dyan whitelist stays the security boundary.
AshDyan.Info.analyzable_field/3 typespec now includes :histogram.