create plausible clickhouse database

clickhouse/charts/databases/templates/init-databases-job.yaml

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+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: clickhouse-db-init
+  labels:
+    app.kubernetes.io/name: clickhouse-db-init
+    app.kubernetes.io/instance: {{ .Release.Name }}
+spec:
+  template:
+    spec:
+      restartPolicy: OnFailure
+      containers:
+        - name: clickhouse-init
+          image: clickhouse/clickhouse-server:{{ .Chart.AppVersion }}
+          command: ["bash", "-c"]
+          args:
+            - |
+              echo "⏳ Waiting for ClickHouse..."
+              until clickhouse-client \
+                --host {{ .Values.clickhouse.host }} \
+                --port {{ .Values.clickhouse.port }} \
+                --user {{ .Values.clickhouse.adminUser }} \
+                --password "{{ .Values.clickhouse.adminPassword }}" \
+                -q "SELECT 1" >/dev/null 2>&1; do
+                sleep 2
+              done
+              echo "✅ ClickHouse ready"
+
+              {{- if .Values.databases }}
+              echo "➡️ Creating declared databases & users..."
+              clickhouse-client \
+                --host {{ .Values.clickhouse.host }} \
+                --port {{ .Values.clickhouse.port }} \
+                --user {{ .Values.clickhouse.adminUser }} \
+                --password "{{ .Values.clickhouse.adminPassword }}" \
+                --multiquery < /config/init.sql
+              {{- end }}
+
+              echo "➡️ Generating list of databases to drop..."
+              clickhouse-client \
+                --host {{ .Values.clickhouse.host }} \
+                --port {{ .Values.clickhouse.port }} \
+                --user {{ .Values.clickhouse.adminUser }} \
+                --password "{{ .Values.clickhouse.adminPassword }}" \
+                -q "
+                  SELECT concat('DROP DATABASE IF EXISTS ', name, ';')
+                  FROM system.databases
+                  WHERE name NOT IN (
+                    'system',
+                    'information_schema',
+                    'INFORMATION_SCHEMA',
+                    'default'
+                    {{- if .Values.databases }}
+                      {{- range $db := .Values.databases }}
+                        , '{{ $db }}'
+                      {{- end }}
+                    {{- end }}
+                  );
+                " > /tmp/to_drop.sql
+
+              if [ -s /tmp/to_drop.sql ]; then
+                echo "➡️ Dropping leftover databases:"
+                cat /tmp/to_drop.sql
+
+                clickhouse-client \
+                  --host {{ .Values.clickhouse.host }} \
+                  --port {{ .Values.clickhouse.port }} \
+                  --user {{ .Values.clickhouse.adminUser }} \
+                  --password "{{ .Values.clickhouse.adminPassword }}" \
+                  --multiquery < /tmp/to_drop.sql
+
+              else
+                echo "✔️ No databases to drop."
+              fi
+
+              echo "🎉 Initialization completed"
+          volumeMounts:
+            - name: init-sql
+              mountPath: /config
+      volumes:
+        - name: init-sql
+          configMap:
+            name: clickhouse-init-sql

clickhouse/charts/databases/templates/init-sql-configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: clickhouse-init-sql
+data:
+  init.sql: |
+    -- This file is auto-generated by Helm
+    -- Databases and users initialization
+
+    {{- range $db := .Values.databases }}
+
+    -- Database: {{ $db }}
+    CREATE DATABASE IF NOT EXISTS {{ $db }};
+
+    -- User: {{ $db }}
+    CREATE USER IF NOT EXISTS {{ $db }}
+      IDENTIFIED BY '{{ $db }}arcodange';
+
+    -- Privileges
+    GRANT CREATE, SELECT, INSERT, ALTER, DROP
+      ON {{ $db }}.*
+      TO {{ $db }};
+
+    {{- end }}