first commit

screens/flow/add_flow_node.py

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+import db
+
+from .ensure_flow_schema import ensure_flow_schema
+from .constants import FLOW_NODE_FIELDS
+
+
+def add_flow_node(slug, screen_id, node_type, x=40, y=40, **fields):
+    ensure_flow_schema(slug)
+    cols = ["screen_id", "node_type", "x", "y"]
+    vals = [screen_id, node_type, x, y]
+    for k, v in fields.items():
+        if k in FLOW_NODE_FIELDS and v not in (None, ""):
+            cols.append(k)
+            vals.append(v)
+    placeholders = ", ".join("?" for _ in cols)
+    conn = db.connect(slug)
+    conn.execute(f"INSERT INTO _flow_nodes ({', '.join(cols)}) VALUES ({placeholders})", vals)
+    node_id = conn.execute("SELECT last_insert_rowid() AS id").fetchone()["id"]
+    conn.commit()
+    conn.close()
+    return node_id