Feature: Custom Indicator Creation

[C00ldudeNoonan]

Original labels: P4-roadmap

Overview

Allow users to create, save, and track custom composite indicators from available data series.

Why This Matters

Power users often have their own proprietary indicators or want to combine multiple series. This creates stickiness and personalization.

Proposed Features

• Formula builder for combining indicators (A + B, A/B, % change, moving averages)
• Visual indicator builder (drag-and-drop)
• Save custom indicators to account
• Share indicators with community (optional)
• Alert on custom indicator thresholds
• Backtest custom indicators against historical data

Example Custom Indicators

• "Misery Index" = Unemployment + Inflation
• "Real Interest Rate" = Fed Funds Rate - CPI
• "Housing Affordability" = Median Home Price / Median Income
• Custom sector rotation signals

Implementation Considerations

• Expression parser for formulas
• Validation of indicator combinations
• Storage of user-created indicators
• Calculation engine for derived series

Priority

Medium-Low - power user feature, build after core features stable

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Migrated from C00ldudeNoonan/economic-data-project-full#92

[C00ldudeNoonan]

Triage note: the proposed features are framed around a UI (formula builder, drag-and-drop, accounts) that no longer matches the project direction (frontend dropped; data platform + AI agents). If kept, this should be reframed as: custom composite indicators defined as data (e.g. a seed/config-driven dbt model, similar to the jinja signal registry in technical_signal_events from #109) that agents can create and query. Otherwise recommend closing.