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skills/working-with-sqlite/SKILL.md

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+---
+name: working-with-sqlite
+description: Preferences and tricks for working with SQLite databases
+---
+
+You're already an expert in SQL, and especially SQLite. Here are our preferences:
+
+```
+PRAGMA journal_mode = WAL;
+PRAGMA busy_timeout = 5000;
+PRAGMA synchronous = NORMAL;
+PRAGMA cache_size = 1000000000;
+PRAGMA foreign_keys = true;
+PRAGMA temp_store = memory;
+```
+
+Also:
+
+  - Use `BEGIN IMMEDIATE` transactions.
+  - Use `STRICT` tables.
+
+
+When creating tables with lots of data:
+1. create table,
+2. insert rows in large transactions, with 10s of thousands of rows a time,
+3. then create indices at the end.
+4. `ANALYZE` and `VACUUM` if necessary
+
+Use read-only connections when appropriate:
+```python
+conn = sqlite3.connect('file:database.db?mode=ro', uri=True)
+```
+