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openspec/specs/chart-data-filtering/spec.md

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+## ADDED Requirements
+
+### Requirement: Line chart date range truncation
+The line chart SHALL display data only up to the current date, not the full natural period.
+
+#### Scenario: Monthly view shows data to current day
+- **GIVEN** today is the 15th of the month
+- **WHEN** the user views the monthly statistics chart
+- **THEN** the chart SHALL display data from the 1st to the 15th only
+- **AND** the X-axis SHALL NOT show dates beyond the current day
+
+#### Scenario: Weekly view shows data to current day
+- **GIVEN** today is Wednesday
+- **WHEN** the user views the weekly statistics chart  
+- **THEN** the chart SHALL display data from Monday to Wednesday only
+- **AND** no flat line segments SHALL appear for future dates
+
+#### Scenario: Yearly view shows data to current month
+- **GIVEN** today is in June
+- **WHEN** the user views the yearly statistics chart
+- **THEN** the chart SHALL display data from January to June only