diff --git a/python/ribasim/ribasim/schemas.py b/python/ribasim/ribasim/schemas.py
index 53b42bc3c..69f455a89 100644
--- a/python/ribasim/ribasim/schemas.py
+++ b/python/ribasim/ribasim/schemas.py
@@ -32,7 +32,7 @@ class BasinStaticSchema(_BaseSchema):
 
 
 class BasinSubgridSchema(_BaseSchema):
-    subgrid_id: Series[int] = pa.Field(nullable=False)
+    subgrid_id: Series[int] = pa.Field(nullable=False, default=0)
     node_id: Series[int] = pa.Field(nullable=False, default=0)
     basin_level: Series[float] = pa.Field(nullable=False)
     subgrid_level: Series[float] = pa.Field(nullable=False)
@@ -49,67 +49,67 @@ class BasinTimeSchema(_BaseSchema):
 
 
 class DiscreteControlConditionSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     listen_feature_type: Series[str] = pa.Field(nullable=True)
-    listen_feature_id: Series[int] = pa.Field(nullable=False)
+    listen_feature_id: Series[int] = pa.Field(nullable=False, default=0)
     variable: Series[str] = pa.Field(nullable=False)
     greater_than: Series[float] = pa.Field(nullable=False)
     look_ahead: Series[float] = pa.Field(nullable=True)
 
 
 class DiscreteControlLogicSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     truth_state: Series[str] = pa.Field(nullable=False)
     control_state: Series[str] = pa.Field(nullable=False)
 
 
 class FlowBoundaryStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     flow_rate: Series[float] = pa.Field(nullable=False)
 
 
 class FlowBoundaryTimeSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     time: Series[Timestamp] = pa.Field(nullable=False)
     flow_rate: Series[float] = pa.Field(nullable=False)
 
 
 class FractionalFlowStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     fraction: Series[float] = pa.Field(nullable=False)
     control_state: Series[str] = pa.Field(nullable=True)
 
 
 class LevelBoundaryStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     level: Series[float] = pa.Field(nullable=False)
 
 
 class LevelBoundaryTimeSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     time: Series[Timestamp] = pa.Field(nullable=False)
     level: Series[float] = pa.Field(nullable=False)
 
 
 class LevelDemandStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     min_level: Series[float] = pa.Field(nullable=False)
     max_level: Series[float] = pa.Field(nullable=False)
-    priority: Series[int] = pa.Field(nullable=False)
+    priority: Series[int] = pa.Field(nullable=False, default=0)
 
 
 class LevelDemandTimeSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     time: Series[Timestamp] = pa.Field(nullable=False)
     min_level: Series[float] = pa.Field(nullable=False)
     max_level: Series[float] = pa.Field(nullable=False)
-    priority: Series[int] = pa.Field(nullable=False)
+    priority: Series[int] = pa.Field(nullable=False, default=0)
 
 
 class LinearResistanceStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     resistance: Series[float] = pa.Field(nullable=False)
     max_flow_rate: Series[float] = pa.Field(nullable=True)
@@ -117,7 +117,7 @@ class LinearResistanceStaticSchema(_BaseSchema):
 
 
 class ManningResistanceStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     length: Series[float] = pa.Field(nullable=False)
     manning_n: Series[float] = pa.Field(nullable=False)
@@ -127,7 +127,7 @@ class ManningResistanceStaticSchema(_BaseSchema):
 
 
 class OutletStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     flow_rate: Series[float] = pa.Field(nullable=False)
     min_flow_rate: Series[float] = pa.Field(nullable=True)
@@ -137,10 +137,10 @@ class OutletStaticSchema(_BaseSchema):
 
 
 class PidControlStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     listen_node_type: Series[str] = pa.Field(nullable=True)
-    listen_node_id: Series[int] = pa.Field(nullable=False)
+    listen_node_id: Series[int] = pa.Field(nullable=False, default=0)
     target: Series[float] = pa.Field(nullable=False)
     proportional: Series[float] = pa.Field(nullable=False)
     integral: Series[float] = pa.Field(nullable=False)
@@ -149,9 +149,9 @@ class PidControlStaticSchema(_BaseSchema):
 
 
 class PidControlTimeSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     listen_node_type: Series[str] = pa.Field(nullable=True)
-    listen_node_id: Series[int] = pa.Field(nullable=False)
+    listen_node_id: Series[int] = pa.Field(nullable=False, default=0)
     time: Series[Timestamp] = pa.Field(nullable=False)
     target: Series[float] = pa.Field(nullable=False)
     proportional: Series[float] = pa.Field(nullable=False)
@@ -161,7 +161,7 @@ class PidControlTimeSchema(_BaseSchema):
 
 
 class PumpStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     flow_rate: Series[float] = pa.Field(nullable=False)
     min_flow_rate: Series[float] = pa.Field(nullable=True)
@@ -170,7 +170,7 @@ class PumpStaticSchema(_BaseSchema):
 
 
 class TabulatedRatingCurveStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     level: Series[float] = pa.Field(nullable=False)
     flow_rate: Series[float] = pa.Field(nullable=False)
@@ -178,29 +178,29 @@ class TabulatedRatingCurveStaticSchema(_BaseSchema):
 
 
 class TabulatedRatingCurveTimeSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     time: Series[Timestamp] = pa.Field(nullable=False)
     level: Series[float] = pa.Field(nullable=False)
     flow_rate: Series[float] = pa.Field(nullable=False)
 
 
 class TerminalStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
 
 
 class UserDemandStaticSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     active: Series[pa.BOOL] = pa.Field(nullable=True)
     demand: Series[float] = pa.Field(nullable=False)
     return_factor: Series[float] = pa.Field(nullable=False)
     min_level: Series[float] = pa.Field(nullable=False)
-    priority: Series[int] = pa.Field(nullable=False)
+    priority: Series[int] = pa.Field(nullable=False, default=0)
 
 
 class UserDemandTimeSchema(_BaseSchema):
-    node_id: Series[int] = pa.Field(nullable=False)
+    node_id: Series[int] = pa.Field(nullable=False, default=0)
     time: Series[Timestamp] = pa.Field(nullable=False)
     demand: Series[float] = pa.Field(nullable=False)
     return_factor: Series[float] = pa.Field(nullable=False)
     min_level: Series[float] = pa.Field(nullable=False)
-    priority: Series[int] = pa.Field(nullable=False)
+    priority: Series[int] = pa.Field(nullable=False, default=0)