diff --git a/webapp/openapi-playground/mod/openapi/OperationView.tsx b/webapp/openapi-playground/mod/openapi/OperationView.tsx
index 4bea8b24..b8f981df 100644
--- a/webapp/openapi-playground/mod/openapi/OperationView.tsx
+++ b/webapp/openapi-playground/mod/openapi/OperationView.tsx
@@ -5,6 +5,7 @@ import { Box, styled } from "@innoai-tech/vueuikit";
 import { ResponseView } from "./ResponseView.tsx";
 import { RequestBuilder } from "./RequestBuilder.tsx";
 import { Markdown } from "@innoai-tech/vuemarkdown";
+import { DatabaseErContainer } from "./components/DatabaseErView.tsx";
 
 export const OperationView = component$({
   operationId: t.string()
@@ -87,24 +88,32 @@ export const OperationView = component$({
       if (!op) {
         return null;
       }
+      if (op.operationId == "SycDatabaseEr") {
+        return (
+          <OperationContainer key={op.operationId}>
+            {$heading}
+            {$desc}
+            <OperationMain>
+              <DatabaseErContainer
+                op={op}
+              />
+            </OperationMain>
+          </OperationContainer>
+        )
+      }
+
       return (
         <OperationContainer key={op.operationId}>
           {$heading}
           {$desc}
-          <Box sx={{
-            flex: 1,
-            overflow: "hidden",
-            display: "flex",
-            flexDirection: "column",
-            alignItems: "stretch"
-          }}>
+          <OperationMain>
             <Box sx={{
               flex: 1,
               overflow: "auto"
             }}>
               {$requestBuilder}
             </Box>
-          </Box>
+          </OperationMain>
         </OperationContainer>
       );
     })
@@ -118,6 +127,16 @@ const OperationContainer = styled("div")({
   alignItems: "stretch"
 });
 
+
+const OperationMain = styled("div")({
+  flex: 1,
+  overflow: "hidden",
+  display: "flex",
+  flexDirection: "column",
+  alignItems: "stretch"
+});
+
+
 const OperationHeading = styled("div")({
   display: "flex",
   alignItems: "center",
diff --git a/webapp/openapi-playground/mod/openapi/components/DatabaseErView.tsx b/webapp/openapi-playground/mod/openapi/components/DatabaseErView.tsx
new file mode 100644
index 00000000..758c0562
--- /dev/null
+++ b/webapp/openapi-playground/mod/openapi/components/DatabaseErView.tsx
@@ -0,0 +1,241 @@
+import { component, component$, rx } from "@innoai-tech/vuekit";
+import type { OperationWithMethodPath } from "../models";
+import { OpenAPIProvider } from "../OpenAPIProvider.tsx";
+import { onMounted } from "vue";
+import { alpha, styled, variant } from "@innoai-tech/vueuikit";
+import { Icon, mdiKey } from "@innoai-tech/vuematerial";
+import { mdiKeyOutline } from "@mdi/js";
+
+export type ErDatabase = {
+  name: string
+  tables: Record<string, ErTable>
+}
+
+export type ErTable = {
+  title?: string
+  description?: string
+  columns: Record<string, ErColumn>
+  constraints: Record<string, ErConstraint>
+}
+
+export type ErColumn = {
+  type: string
+  title?: string
+  description?: string
+  of?: string
+}
+
+export type ErConstraint = {
+  title?: string
+  description?: string
+  columnNames: Array<string>
+  method?: string
+  unique?: boolean
+  primary?: boolean
+}
+
+
+export const DatabaseErContainer = component$<{
+  op: OperationWithMethodPath
+}>((props, { render }) => {
+
+  const openapi$ = OpenAPIProvider.use();
+
+  onMounted(() => {
+    openapi$.request(props.op.operationId, {});
+  });
+
+  return rx(
+    openapi$.response$(props.op.operationId),
+    render((resp) => {
+      return <DatabaseErView database={resp.body} />;
+    })
+  );
+});
+
+export const DatabaseErView = component<{
+  database: ErDatabase
+}>((props) => {
+  return () => {
+    return (
+      <DatabaseErMain>
+        <DatabaseErHeader>
+          {props.database.name}
+        </DatabaseErHeader>
+        {Object.keys(props.database.tables).toSorted().map((tableName) => {
+          const t = props.database.tables[tableName] ?? { columns: {}, constraints: {} };
+
+          const columns = t.columns;
+          const constraints = t.constraints;
+
+          return (
+            <DatabaseErTable open={true}>
+              <DatabaseErTableSummary>
+                <span>
+                  {tableName}
+                </span>
+                <Spacer />
+                <span>
+                   {t.title}
+                </span>
+              </DatabaseErTableSummary>
+              {Object.keys(columns).toSorted().map((colName) => {
+                const col = columns[colName]!;
+
+                return (
+                  <DatabaseErTableDef>
+                    <DatabaseErTableColumnName>
+                      {colName}
+                    </DatabaseErTableColumnName>
+                    {col.of ? (
+                      <DatabaseErTableColumnOf>
+                        {col.of}
+                      </DatabaseErTableColumnOf>
+                    ) : (
+                      <DatabaseErTableColumnType>
+                        {col.type}
+                      </DatabaseErTableColumnType>
+                    )}
+                    <DatabaseErTableColumnComment>
+                      {col.title}
+                    </DatabaseErTableColumnComment>
+                  </DatabaseErTableDef>
+                );
+              })}
+
+              {Object.entries(constraints).toSorted(([name1, c1], [name2, c2]) => {
+                if (c2.primary && !c1.primary) {
+                  return 1;
+                }
+
+                if (!c2.primary && c1.primary) {
+                  return -1;
+                }
+
+                if (c2.unique && !c1.unique) {
+                  return 1;
+                }
+
+                if (!c2.unique && c1.unique) {
+                  return -1;
+                }
+
+                return name1.localeCompare(name2);
+              }).map(([constraintName, constraint]) => {
+
+                return (
+                  <DatabaseErTableDef>
+                    <DatabaseErTableConstraintName
+                      data-primary={constraint.primary}
+                    >
+                      <Icon path={constraint.unique ? mdiKeyOutline : mdiKey} />
+                      <span>
+                        {constraintName}
+                      </span>
+                      <span>
+                        ({constraint.columnNames.join(",")})
+                      </span>
+                    </DatabaseErTableConstraintName>
+                  </DatabaseErTableDef>
+                );
+              })}
+            </DatabaseErTable>
+          );
+        })}
+      </DatabaseErMain>
+    );
+  };
+});
+
+
+const DatabaseErMain = styled("div")({
+  py: 18,
+  px: 24,
+  flex: 1,
+  overflow: "auto"
+});
+
+const DatabaseErHeader = styled("div")({
+  py: 8,
+  px: 16,
+  textStyle: "sys.label-large"
+});
+
+
+const DatabaseErTable = styled("details")({
+  "& + &": {
+    mt: 16
+  },
+
+  rounded: "sm",
+  border: "1px solid",
+  borderColor: variant("sys.outline-variant", alpha(0.38)),
+  overflow: "hidden"
+});
+
+const DatabaseErTableSummary = styled("summary")({
+  textStyle: "sys.label-large",
+  py: 8,
+  px: 16,
+  display: "flex",
+  color: "sys.primary"
+});
+
+
+const DatabaseErTableDef = styled("div")({
+  px: 16,
+  py: 4,
+  display: "flex",
+  "&:hover": {
+    containerStyle: "sys.surface-container-low"
+  }
+});
+
+
+export const DatabaseErTableColumnName = styled("div")({
+  display: "flex",
+  width: "20vw",
+  textStyle: "sys.label-small",
+  font: "code"
+});
+
+
+export const DatabaseErTableColumnComment = styled("div")({
+  display: "flex",
+  textStyle: "sys.label-small",
+  width: "20vw",
+  justifyContent: "end"
+});
+
+export const DatabaseErTableColumnOf = styled("div")({
+  flex: 1,
+  textStyle: "sys.label-small",
+  font: "code",
+  color: "sys.primary"
+});
+
+
+export const DatabaseErTableColumnType = styled("div")({
+  flex: 1,
+  textStyle: "sys.label-small"
+});
+
+
+export const DatabaseErTableConstraintName = styled("div")({
+  flex: 1,
+  textStyle: "sys.label-small",
+  font: "code",
+  display: "flex",
+  alignItems: "center",
+  gap: "1em",
+
+  _primary: {
+    [`${Icon}`]: {
+      color: "sys.primary"
+    }
+  }
+});
+
+const Spacer = styled("div")({
+  flex: 1
+});
\ No newline at end of file