first commit

screens/flow/add_flow_edge.py

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+import db
+
+
+def add_flow_edge(slug, screen_id, from_node_id, from_port, to_node_id):
+    conn = db.connect(slug)
+    conn.execute(
+        "INSERT INTO _flow_edges (screen_id, from_node_id, from_port, to_node_id) VALUES (?, ?, ?, ?)",
+        (screen_id, from_node_id, from_port or "out", to_node_id),
+    )
+    edge_id = conn.execute("SELECT last_insert_rowid() AS id").fetchone()["id"]
+    conn.commit()
+    conn.close()
+    return edge_id