Add OpenScale SQLite database scraper

Reads weight measurements from OpenScale backup SQLite database.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

personal_data/fetchers/openscale.py

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+"""OpenScale SQLite database fetcher.
+
+Reads weight measurements from an OpenScale backup SQLite database.
+OpenScale is an open-source weight tracking app for Android.
+"""
+
+import dataclasses
+import sqlite3
+from pathlib import Path
+
+from personal_data.data import DeduplicateMode, Scraper
+
+DATABASE_PATH = '/home/jmaa/Notes/Rawbackupdata/ScaleWeight/2025-06-24_openScale.db'
+
+@dataclasses.dataclass(frozen=True)
+class OpenScale(Scraper):
+    dataset_name = 'openscale_measurements'
+    deduplicate_mode = DeduplicateMode.BY_ALL_COLUMNS
+
+    @staticmethod
+    def requires_cfscrape() -> bool:
+        return False
+
+    def scrape(self):
+        """Read weight measurements from OpenScale SQLite database."""
+        db_path = Path(DATABASE_PATH)
+
+        if not db_path.exists():
+            raise FileNotFoundError(f'OpenScale database not found at {DATABASE_PATH}')
+
+        with sqlite3.connect(db_path) as conn:
+            conn.row_factory = sqlite3.Row
+            cursor = conn.cursor()
+
+            cursor.execute("""
+                SELECT datetime, weight
+                FROM scaleMeasurements
+                ORDER BY datetime
+            """)
+
+            for row in cursor.fetchall():
+                yield {'datetime': row['datetime'], 'weight': row['weight']}