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    <h1>Sensor Readouts &mdash; API Documentation</h1>

    <h2>Base URL</h2>
    <p><code>http://localhost:5000/api</code></p>

    <!-- GET /api/sensors -->
    <h2>GET /api/sensors</h2>
    <div class="endpoint">
        <span class="method get">GET</span><span class="path">/api/sensors</span>
        <p class="desc">Return a list of all sensors ordered by name.</p>
        <p class="section-label">curl</p>
<pre><code>curl http://localhost:5000/api/sensors</code></pre>
        <p class="section-label">Response 200</p>
<pre><code>[
  { "id": 1, "name": "outdoor-station" },
  { "id": 2, "name": "indoor-unit" }
]</code></pre>
    </div>

    <!-- POST /api/sensors -->
    <div class="endpoint">
        <span class="method post">POST</span><span class="path">/api/sensors</span>
        <p class="desc">Create a new sensor.</p>
        <p class="section-label">curl</p>
<pre><code>curl -X POST http://localhost:5000/api/sensors \
     -H "Content-Type: application/json" \
     -d '{"name": "new-sensor"}'</code></pre>
        <p class="section-label">Response 201</p>
<pre><code>{ "id": 5, "name": "new-sensor" }</code></pre>
        <p><strong>Errors:</strong></p>
        <table>
            <tr><th>Code</th><th>Condition</th></tr>
            <tr><td>400</td><td><code>name</code> is missing or empty</td></tr>
            <tr><td>409</td><td>Sensor with this name already exists</td></tr>
        </table>
    </div>

    <!-- GET /api/sensors/:id/types -->
    <h2>GET /api/sensors/:id/types</h2>
    <div class="endpoint">
        <span class="method get">GET</span><span class="path">/api/sensors/:id/types</span>
        <p class="desc">Return distinct readout types available for a given sensor.</p>
        <p class="section-label">curl</p>
<pre><code>curl http://localhost:5000/api/sensors/1/types</code></pre>
        <p class="section-label">Response 200</p>
<pre><code>["humidity", "pressure", "temperature"]</code></pre>
        <p><strong>Errors:</strong></p>
        <table>
            <tr><th>Code</th><th>Condition</th></tr>
            <tr><td>404</td><td>Sensor not found</td></tr>
        </table>
    </div>

    <!-- GET /api/sensors/:id/readouts -->
    <h2>GET /api/sensors/:id/readouts</h2>
    <div class="endpoint">
        <span class="method get">GET</span><span class="path">/api/sensors/:id/readouts</span>
        <p class="desc">Return the latest readouts for a sensor. Optional <code>type</code> query parameter filters by readout type.</p>
        <p><strong>Query parameters:</strong></p>
        <table>
            <tr><th>Param</th><th>Type</th><th>Description</th></tr>
            <tr><td>type</td><td>string</td><td>Filter by type (e.g. <code>temperature</code>)</td></tr>
        </table>
        <p class="section-label">curl</p>
<pre><code># all types
curl http://localhost:5000/api/sensors/1/readouts

# filter by type
curl "http://localhost:5000/api/sensors/1/readouts?type=temperature"</code></pre>
        <p class="section-label">Response 200</p>
<pre><code>[
  { "value": 24.31, "timestamp": "2026-09-11T10:30:00" },
  { "value": 24.15, "timestamp": "2026-09-11T10:29:30" }
]</code></pre>
    </div>

    <!-- POST /api/sensors/:id/readouts -->
    <div class="endpoint">
        <span class="method post">POST</span><span class="path">/api/sensors/:id/readouts</span>
        <p class="desc">Add a new readout to an existing sensor. Timestamp is generated server-side.</p>
        <p class="section-label">curl</p>
<pre><code>curl -X POST http://localhost:5000/api/sensors/1/readouts \
     -H "Content-Type: application/json" \
     -d '{"type": "temperature", "value": 22.5}'</code></pre>
        <p class="section-label">Response 201</p>
<pre><code>{
  "id": 2702,
  "sensor_id": 1,
  "type": "temperature",
  "value": 22.5,
  "timestamp": "2026-09-11T17:00:00.123456"
}</code></pre>
        <p><strong>Errors:</strong></p>
        <table>
            <tr><th>Code</th><th>Condition</th></tr>
            <tr><td>400</td><td>Missing <code>type</code> or <code>value</code>, or <code>value</code> is not a number</td></tr>
            <tr><td>404</td><td>Sensor not found</td></tr>
        </table>
    </div>

    <div class="note">
        <strong>Note:</strong> All request and response bodies use <code>application/json</code>.
    </div>

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