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        <div class="kicker">Cheatsheet • SQLCipher • PRAGMAs</div>
        <h1 id="title" class="title">Useful SQL and PRAGMA Commands (SQLCipher)</h1>
        <p class="lead">A quick reference for common SQLCipher‑related commands around keying, rekeying, integrity checks, exporting a plaintext copy and performance tuning. Use carefully and always back up first.</p>
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        <strong>Notes</strong>
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          <li>Run in DB Browser’s SQL editor for advanced scenarios.</li>
          <li>Some commands depend on SQLCipher version/build.</li>
          <li>Test on a copy; verify results after each step.</li>
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    <!-- Keying and rekeying -->
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      <h2 style="margin:0 0 6px 0">Keying and rekeying (advanced)</h2>
      <p class="muted">DB Browser provides UI actions for encryption and passphrase changes. For reference, advanced users may use PRAGMAs in compatible environments.</p>
      <pre><code>-- Open an encrypted database with a passphrase (when supported)
PRAGMA key = 'your passphrase here';

-- Change passphrase (rekey)
PRAGMA rekey = 'your new passphrase here';</code></pre>
      <p class="muted">Prefer the built‑in UI for routine operations. Always back up before rekeying.</p>
    </section>

    <!-- Check cipher parameters -->
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      <h2 style="margin:0 0 6px 0">Check cipher parameters (read‑only)</h2>
      <pre><code>-- Cipher version (if exposed)
PRAGMA cipher_version;

-- Typical parameters to verify (availability may vary)
PRAGMA cipher_page_size;   -- e.g., 4096
PRAGMA kdf_iter;           -- e.g., iteration count</code></pre>
      <p class="muted">If these are unavailable in your build, check settings in the environment where the DB was created, or use project documentation.</p>
    </section>

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      <h2 style="margin:0 0 6px 0">Export a plaintext copy (handle with care)</h2>
      <p class="muted">To create a non‑encrypted copy for interoperability. Handle the plaintext output securely and remove when done.</p>
      <pre><code>-- Attach a new plaintext database and export
ATTACH DATABASE 'plain_copy.db' AS plaintext KEY '';
SELECT sqlcipher_export('plaintext');
DETACH DATABASE plaintext;</code></pre>
      <p class="muted">Verify the output by reopening the copy. Consider redacting sensitive fields before export.</p>
    </section>

    <!-- Integrity checks -->
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      <h2 style="margin:0 0 6px 0">Integrity checks</h2>
      <pre><code>-- Quick check (general)
PRAGMA quick_check;

-- Full integrity check (general)
PRAGMA integrity_check;

-- Cipher integrity (if supported by your build)
PRAGMA cipher_integrity_check;</code></pre>
      <p class="muted">Run checks after unexpected shutdowns or when corruption is suspected. Always keep backups.</p>
    </section>

    <!-- Performance PRAGMAs -->
    <section style="margin-top:18px" class="card">
      <h2 style="margin:0 0 6px 0">Performance PRAGMAs (tune and test)</h2>
      <pre><code>-- WAL can improve read concurrency
PRAGMA journal_mode = WAL;

-- Balance durability and speed
PRAGMA synchronous = NORMAL;  -- test FULL vs NORMAL

-- Cache size (negative = KiB)
PRAGMA cache_size = -65536;   -- ~64 MiB cache (adjust)

-- Temp store in memory (if RAM allows)
PRAGMA temp_store = MEMORY;</code></pre>
      <p class="muted">Always test with realistic data and workloads. See <a href="/performance-tips.html">Performance tips</a> for context and caveats.</p>
    </section>

    <!-- Query analysis: EXPLAIN -->
    <section style="margin-top:18px" class="card">
      <h2 style="margin:0 0 6px 0">Analyze queries (indexes & plans)</h2>
      <pre><code>-- See how a query will run
EXPLAIN QUERY PLAN
SELECT *
FROM your_table
WHERE columnA = ?
ORDER BY created_at DESC;</code></pre>
      <p class="muted">Create indexes that match WHERE/JOIN/ORDER BY usage. Avoid over‑indexing; it slows writes and uses disk.</p>
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