Auto rules engine¶


ID	`MOD-090`
System	SD08
Repo	`bank-app`
Build status	Not started
Deployed	No

What it does¶

MOD-090 is the auto rules engine. It stores and applies user-defined rules and implicitly learned rules that override or confirm the base classification from MOD-088.

Rule types¶

Explicit rules — created directly by the customer: - "This merchant is always a business expense for me" - "Uber rides between 8–9am on weekdays are personal commute (non-claimable)" - "All transactions over $200 at hardware stores are property expenses"

Implicit rules — learned from user corrections: - If a user consistently reclassifies a given merchant from "Personal" to "Business", MOD-090 generates an implicit rule after a configurable number of confirmations and applies it to future transactions automatically, pending a one-time user review of the inferred rule.

Rule priority¶

Rules are applied in priority order: explicit rules override implicit rules, which override the base model output from MOD-088. All overrides are logged with the rule ID and basis so the customer can audit why a transaction was classified as it was.

Feedback loop¶

Confirmed and corrected classifications from MOD-090 are fed back to MOD-088 as labelled training examples. This is the primary mechanism by which the classification model personalises over time.

Design phase¶

This module is in design. Build begins in Phase 2 of the Expense Intelligence Platform. See the Expense Intelligence Platform summary for the full implementation roadmap.

Module dependencies¶

Depends on¶

Module	Title	Required?	Contract	Reason
MOD-088	Expense classification engine	Required	`contract/events/`	Auto rules engine reads and overrides classification outputs from MOD-088; user-confirmed rules feed back into the classification model.

Required by¶

Module	Title	As	Contract
MOD-088	Expense classification engine	Optional enhancement	`contract/events/`

Policies satisfied¶

Policy	Title	Mode	How
PRI-001	Privacy Policy	`LOG`	User-defined and inferred classification rules constitute personal financial data; rule creation, modification, and application events are logged for data minimisation audits and individual access requests.

Capabilities satisfied¶

(No capabilities mapped)

Part of SD08 — Customer App & Back Office Platform Compiled 2026-05-22 from source/entities/modules/MOD-090.yaml