diff --git a/api/s0_base.py b/api/s0_base.py
index 87350a7..37917e9 100644
--- a/api/s0_base.py
+++ b/api/s0_base.py
@@ -6,12 +6,12 @@ _LINK = "_link"
 _CURVE = "_curve"
 _PATTERN = "_pattern"
 
-JUNCTION = "JUNCTION"
-RESERVOIR = "RESERVOIR"
-TANK = "TANK"
-PIPE = "PIPE"
-PUMP = "PUMP"
-VALVE = "VALVE"
+JUNCTION = "junction"
+RESERVOIR = "reservoir"
+TANK = "tank"
+PIPE = "pipe"
+PUMP = "pump"
+VALVE = "valve"
 
 def _get_from(name: str, id: str, base_type: str) -> Row | None:
     with conn[name].cursor(row_factory=dict_row) as cur:
diff --git a/script/sql/create/0.base.sql b/script/sql/create/0.base.sql
index 4ee4fde..e936579 100644
--- a/script/sql/create/0.base.sql
+++ b/script/sql/create/0.base.sql
@@ -1,6 +1,6 @@
-CREATE TYPE _NODE_TYPE AS ENUM ('JUNCTION', 'RESERVOIR', 'TANK');
+CREATE TYPE _NODE_TYPE AS ENUM ('junction', 'reservoir', 'tank');
 
-CREATE TYPE _LINK_TYPE AS ENUM ('PIPE', 'PUMP', 'VALVE');
+CREATE TYPE _LINK_TYPE AS ENUM ('pipe', 'pump', 'valve');
 
 CREATE TABLE _NODE
 (