Offer multiple timing windows for repeater telemetry pickup. Closes #192.

app/migrations/_057_telemetry_interval_hours.py

@@ -0,0 +1,22 @@
+import logging
+
+import aiosqlite
+
+logger = logging.getLogger(__name__)
+
+
+async def migrate(conn: aiosqlite.Connection) -> None:
+    """Add telemetry_interval_hours integer column to app_settings."""
+    tables_cursor = await conn.execute("SELECT name FROM sqlite_master WHERE type='table'")
+    if "app_settings" not in {row[0] for row in await tables_cursor.fetchall()}:
+        await conn.commit()
+        return
+    col_cursor = await conn.execute("PRAGMA table_info(app_settings)")
+    columns = {row[1] for row in await col_cursor.fetchall()}
+    if "telemetry_interval_hours" not in columns:
+        # Default to 8 hours, matching the previous hard-coded interval
+        # so existing users see no behavior change until they opt in.
+        await conn.execute(
+            "ALTER TABLE app_settings ADD COLUMN telemetry_interval_hours INTEGER DEFAULT 8"
+        )
+        await conn.commit()