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specs/002-feature-use-centraldb/data-model.md

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+# Data Model
+
+## Entities
+
+### WorkoutAnalysis (Cache)
+
+- **Description**: Represents a cached workout analysis result. This is an in-memory object to speed up subsequent requests for the same analysis.
+- **Fields**:
+    - `activity_id`: The ID of the activity.
+    - `analysis_summary`: JSON object containing the summary of the analysis.
+    - `charts`: Dictionary of chart types to chart data.
+    - `timestamp`: The time when the analysis was cached.
+
+### AnalysisArtifact (CentralDB)
+
+- **Description**: Represents a stored analysis artifact in the CentralDB. This is the long-term storage for the analysis results.
+- **Fields** (based on the CentralDB API):
+    - `id`: Unique identifier of the artifact.
+    - `activity_id`: The ID of the activity.
+    - `data`: JSON object containing the analysis results.
+    - `created_at`: Timestamp of when the artifact was created.