feat: reconcile dossier timelines with billing

site/db/connection.py

@@ -208,6 +208,7 @@ def _create_schema(conn):
             price TEXT,
             qty TEXT,
             sum TEXT,
+            vat_rate TEXT,
             vat_mode TEXT NOT NULL DEFAULT 'with_vat',
             source_document_id TEXT REFERENCES documents(id) ON DELETE CASCADE,
             closed_by_document_id TEXT REFERENCES documents(id) ON DELETE SET NULL,
@@ -250,6 +251,16 @@ def _create_schema(conn):
         CREATE INDEX IF NOT EXISTS idx_exceptions_dossier ON exceptions_queue(dossier_id);
         CREATE INDEX IF NOT EXISTS idx_exceptions_batch ON exceptions_queue(batch_id);
     """)
+    # Existing /tmp databases survive application restarts. Additive migrations
+    # therefore inspect the live schema before ALTER TABLE, while fresh databases
+    # receive the same column from the CREATE TABLE definition above.
+    timeline_columns = {
+        row["name"] for row in conn.execute("PRAGMA table_info(timeline_intervals)").fetchall()
+    }
+    if "vat_rate" not in timeline_columns:
+        conn.execute("ALTER TABLE timeline_intervals ADD COLUMN vat_rate TEXT")
+        if not getattr(_local, "in_transaction", False):
+            conn.commit()
 
 
 def cleanup_db():