https://safer-capstone.pages.dev/developer-docs/overview/schemas/Recent content in Local Database on SAFER DocumentationHugoenhttps://safer-capstone.pages.dev/developer-docs/overview/schemas/cpm-history/Mon, 01 Jan 0001 00:00:00 +0000https://safer-capstone.pages.dev/developer-docs/overview/schemas/cpm-history/<h1 id="cpm-history-schema">CPM History Schema</h1> <h2 id="database">Database</h2> <ul> <li>File: <code>weather_cache.db</code></li> <li>Engine: <code>expo-sqlite</code></li> </ul> <h2 id="table-cpm_history">Table: <code>cpm_history</code></h2> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Null</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td><code>cpm</code></td> <td><code>REAL</code></td> <td><code>NOT NULL</code></td> <td>One computed CPM value per successful minute tick.</td> </tr> <tr> <td><code>timestamp</code></td> <td><code>INTEGER</code></td> <td><code>NOT NULL</code></td> <td>Epoch milliseconds when the value was recorded.</td> </tr> </tbody> </table> <h2 id="data-invariants">Data Invariants</h2> <ul> <li>Each row stores only <code>cpm</code> and <code>timestamp</code>.</li> <li>Values must be finite numbers (<code>insertCpmRow</code> validates inputs).</li> <li>Retention is capped at 40 rows; oldest rows are removed first on insert overflow.</li> </ul> <h2 id="access-patterns">Access Patterns</h2> <ul> <li>Insert and bounded retention: <code>insertCpmRow(cpm, timestamp?)</code>.</li> <li>Recent read window: <code>getRecentCpmRows(sinceTimestamp, limit)</code>.</li> <li>Read ordering: newest first (<code>ORDER BY timestamp DESC, rowid DESC</code>).</li> </ul>https://safer-capstone.pages.dev/developer-docs/overview/schemas/weather-cache/Mon, 01 Jan 0001 00:00:00 +0000https://safer-capstone.pages.dev/developer-docs/overview/schemas/weather-cache/<h1 id="weather-cache-schema">Weather Cache Schema</h1> <h2 id="database">Database</h2> <ul> <li>File: <code>weather_cache.db</code></li> <li>Engine: <code>expo-sqlite</code></li> <li>Journal mode: <code>WAL</code></li> </ul> <h2 id="table-forecast_points">Table: <code>forecast_points</code></h2> <table> <thead> <tr> <th>Column</th> <th>Type</th> <th>Null</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td><code>cell_id</code></td> <td><code>TEXT</code></td> <td><code>NOT NULL</code></td> <td>Spatial cache bucket key from lat/lon.</td> </tr> <tr> <td><code>forecast_time</code></td> <td><code>TEXT</code></td> <td><code>NOT NULL</code></td> <td>Canonical UTC hour key (<code>toHourKey(...)</code>).</td> </tr> <tr> <td><code>valid_to</code></td> <td><code>INTEGER</code></td> <td><code>NOT NULL</code></td> <td>Expiration timestamp in epoch milliseconds.</td> </tr> <tr> <td><code>payload</code></td> <td><code>TEXT</code></td> <td><code>NOT NULL</code></td> <td>JSON-serialized <code>WeatherPoint</code>.</td> </tr> <tr> <td><code>last_accessed</code></td> <td><code>INTEGER</code></td> <td><code>NOT NULL</code></td> <td>Epoch milliseconds for LRU eviction.</td> </tr> </tbody> </table> <p>Primary key:</p>