diff --git a/pom.xml b/pom.xml
index 4acdeb2..0469bd9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -80,6 +80,14 @@
             <artifactId>spring-boot-starter-actuator</artifactId>
         </dependency>
 
+        <!-- ClickHouse JDBC (tenant data cleanup on delete) -->
+        <dependency>
+            <groupId>com.clickhouse</groupId>
+            <artifactId>clickhouse-jdbc</artifactId>
+            <version>0.9.7</version>
+            <classifier>all</classifier>
+        </dependency>
+
         <!-- Docker Java (tenant provisioning) -->
         <dependency>
             <groupId>com.github.docker-java</groupId>
diff --git a/src/main/java/net/siegeln/cameleer/saas/provisioning/DockerTenantProvisioner.java b/src/main/java/net/siegeln/cameleer/saas/provisioning/DockerTenantProvisioner.java
index ab43101..b0a7cad 100644
--- a/src/main/java/net/siegeln/cameleer/saas/provisioning/DockerTenantProvisioner.java
+++ b/src/main/java/net/siegeln/cameleer/saas/provisioning/DockerTenantProvisioner.java
@@ -95,9 +95,49 @@ public class DockerTenantProvisioner implements TenantProvisioner {
 
     @Override
     public void remove(String slug) {
-        removeContainer(uiContainerName(slug));
-        removeContainer(serverContainerName(slug));
+        // 1. Remove ALL containers labeled for this tenant (app containers + server + UI)
+        try {
+            var containers = docker.listContainersCmd()
+                .withLabelFilter(List.of("cameleer.tenant=" + slug))
+                .withShowAll(true)
+                .exec();
+            for (var container : containers) {
+                try {
+                    docker.removeContainerCmd(container.getId()).withForce(true).exec();
+                    log.info("Removed tenant container: {} ({})", container.getNames(), container.getId().substring(0, 12));
+                } catch (NotFoundException ignored) {}
+            }
+        } catch (Exception e) {
+            log.warn("Failed to list/remove tenant containers for '{}': {}", slug, e.getMessage());
+            // Fall back to named removal for server/UI
+            removeContainer(uiContainerName(slug));
+            removeContainer(serverContainerName(slug));
+        }
+
+        // 2. Remove per-environment networks (cameleer-env-{slug}-*)
+        try {
+            String envNetPrefix = "cameleer-env-" + slug + "-";
+            var networks = docker.listNetworksCmd().exec();
+            for (var network : networks) {
+                if (network.getName().startsWith(envNetPrefix)) {
+                    removeNetwork(network.getName());
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Failed to clean up env networks for '{}': {}", slug, e.getMessage());
+        }
+
+        // 3. Remove tenant network
         removeNetwork(tenantNetworkName(slug));
+
+        // 4. Remove JAR volume
+        try {
+            docker.removeVolumeCmd("cameleer-jars-" + slug).exec();
+            log.info("Removed JAR volume: cameleer-jars-{}", slug);
+        } catch (NotFoundException ignored) {
+        } catch (Exception e) {
+            log.warn("Failed to remove JAR volume for '{}': {}", slug, e.getMessage());
+        }
     }
 
     @Override
diff --git a/src/main/java/net/siegeln/cameleer/saas/provisioning/ProvisioningProperties.java b/src/main/java/net/siegeln/cameleer/saas/provisioning/ProvisioningProperties.java
index e01870d..62d77f4 100644
--- a/src/main/java/net/siegeln/cameleer/saas/provisioning/ProvisioningProperties.java
+++ b/src/main/java/net/siegeln/cameleer/saas/provisioning/ProvisioningProperties.java
@@ -11,6 +11,7 @@ public record ProvisioningProperties(
     String publicHost,
     String publicProtocol,
     String datasourceUrl,
+    String clickhouseUrl,
     String oidcIssuerUri,
     String oidcJwkSetUri,
     String corsOrigins
diff --git a/src/main/java/net/siegeln/cameleer/saas/provisioning/TenantDataCleanupService.java b/src/main/java/net/siegeln/cameleer/saas/provisioning/TenantDataCleanupService.java
new file mode 100644
index 0000000..c1a3d09
--- /dev/null
+++ b/src/main/java/net/siegeln/cameleer/saas/provisioning/TenantDataCleanupService.java
@@ -0,0 +1,89 @@
+package net.siegeln.cameleer.saas.provisioning;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Cleans up tenant data from the server PostgreSQL and ClickHouse databases
+ * when a tenant is deleted (GDPR data erasure).
+ */
+@Service
+public class TenantDataCleanupService {
+
+    private static final Logger log = LoggerFactory.getLogger(TenantDataCleanupService.class);
+
+    private final ProvisioningProperties props;
+
+    public TenantDataCleanupService(ProvisioningProperties props) {
+        this.props = props;
+    }
+
+    public void cleanup(String slug) {
+        dropPostgresSchema(slug);
+        deleteClickHouseData(slug);
+    }
+
+    private void dropPostgresSchema(String slug) {
+        String url = props.datasourceUrl();
+        if (url == null || url.isBlank()) {
+            log.warn("No server datasource URL configured — skipping PostgreSQL schema cleanup");
+            return;
+        }
+
+        String schema = "tenant_" + slug;
+        if (!schema.matches("^[a-z0-9_-]+$")) {
+            log.error("Refusing to drop schema with unexpected characters: {}", schema);
+            return;
+        }
+
+        try (Connection conn = DriverManager.getConnection(url, "cameleer", "cameleer_dev");
+             Statement stmt = conn.createStatement()) {
+            stmt.execute("DROP SCHEMA IF EXISTS \"" + schema + "\" CASCADE");
+            log.info("Dropped PostgreSQL schema: {}", schema);
+        } catch (Exception e) {
+            log.warn("Failed to drop PostgreSQL schema '{}': {}", schema, e.getMessage());
+        }
+    }
+
+    private void deleteClickHouseData(String slug) {
+        String url = props.clickhouseUrl();
+        if (url == null || url.isBlank()) {
+            log.warn("No ClickHouse URL configured — skipping ClickHouse data cleanup");
+            return;
+        }
+
+        try (Connection conn = DriverManager.getConnection(url);
+             Statement stmt = conn.createStatement()) {
+
+            // Find all tables with a tenant_id column
+            List<String> tables = new ArrayList<>();
+            try (ResultSet rs = stmt.executeQuery(
+                    "SELECT DISTINCT table FROM system.columns " +
+                    "WHERE database = currentDatabase() AND name = 'tenant_id'")) {
+                while (rs.next()) {
+                    tables.add(rs.getString(1));
+                }
+            }
+
+            for (String table : tables) {
+                try {
+                    stmt.execute("ALTER TABLE `" + table + "` DELETE WHERE tenant_id = '" + slug + "'");
+                    log.info("Deleted ClickHouse data for tenant '{}' from table '{}'", slug, table);
+                } catch (Exception e) {
+                    log.warn("Failed to delete from ClickHouse table '{}' for tenant '{}': {}",
+                            table, slug, e.getMessage());
+                }
+            }
+        } catch (Exception e) {
+            log.warn("Failed to clean up ClickHouse data for tenant '{}': {}", slug, e.getMessage());
+        }
+    }
+}
diff --git a/src/main/java/net/siegeln/cameleer/saas/vendor/VendorTenantService.java b/src/main/java/net/siegeln/cameleer/saas/vendor/VendorTenantService.java
index 6237dab..fd39639 100644
--- a/src/main/java/net/siegeln/cameleer/saas/vendor/VendorTenantService.java
+++ b/src/main/java/net/siegeln/cameleer/saas/vendor/VendorTenantService.java
@@ -6,6 +6,7 @@ import net.siegeln.cameleer.saas.identity.LogtoConfig;
 import net.siegeln.cameleer.saas.identity.LogtoManagementClient;
 import net.siegeln.cameleer.saas.identity.ServerApiClient;
 import net.siegeln.cameleer.saas.provisioning.ProvisioningProperties;
+import net.siegeln.cameleer.saas.provisioning.TenantDataCleanupService;
 import net.siegeln.cameleer.saas.identity.ServerApiClient.ServerHealthResponse;
 import net.siegeln.cameleer.saas.license.LicenseEntity;
 import net.siegeln.cameleer.saas.license.LicenseService;
@@ -45,6 +46,7 @@ public class VendorTenantService {
     private final LogtoConfig logtoConfig;
     private final AuditService auditService;
     private final ProvisioningProperties provisioningProps;
+    private final TenantDataCleanupService dataCleanupService;
 
     public VendorTenantService(TenantService tenantService,
                                TenantRepository tenantRepository,
@@ -54,7 +56,8 @@ public class VendorTenantService {
                                LogtoManagementClient logtoClient,
                                LogtoConfig logtoConfig,
                                AuditService auditService,
-                               ProvisioningProperties provisioningProps) {
+                               ProvisioningProperties provisioningProps,
+                               TenantDataCleanupService dataCleanupService) {
         this.tenantService = tenantService;
         this.tenantRepository = tenantRepository;
         this.licenseService = licenseService;
@@ -64,6 +67,7 @@ public class VendorTenantService {
         this.logtoConfig = logtoConfig;
         this.auditService = auditService;
         this.provisioningProps = provisioningProps;
+        this.dataCleanupService = dataCleanupService;
     }
 
     @Transactional
@@ -296,6 +300,9 @@ public class VendorTenantService {
             }
         }
 
+        // Erase tenant data from server databases (GDPR)
+        dataCleanupService.cleanup(tenant.getSlug());
+
         // Soft-delete
         tenant.setStatus(TenantStatus.DELETED);
         tenantRepository.save(tenant);
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 4df2043..0d39f4f 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -49,6 +49,7 @@ cameleer:
     public-host: ${PUBLIC_HOST:localhost}
     public-protocol: ${PUBLIC_PROTOCOL:https}
     datasource-url: ${CAMELEER_SERVER_DB_URL:jdbc:postgresql://postgres:5432/cameleer3}
+    clickhouse-url: ${CLICKHOUSE_URL:jdbc:clickhouse://clickhouse:8123/cameleer}
     oidc-issuer-uri: ${PUBLIC_PROTOCOL:https}://${PUBLIC_HOST:localhost}/oidc
     oidc-jwk-set-uri: http://logto:3001/oidc/jwks
     cors-origins: ${PUBLIC_PROTOCOL:https}://${PUBLIC_HOST:localhost}
diff --git a/src/test/java/net/siegeln/cameleer/saas/portal/TenantPortalServiceTest.java b/src/test/java/net/siegeln/cameleer/saas/portal/TenantPortalServiceTest.java
index 18466a3..4a86de9 100644
--- a/src/test/java/net/siegeln/cameleer/saas/portal/TenantPortalServiceTest.java
+++ b/src/test/java/net/siegeln/cameleer/saas/portal/TenantPortalServiceTest.java
@@ -47,7 +47,7 @@ class TenantPortalServiceTest {
     private TenantProvisioner tenantProvisioner;
 
     private final ProvisioningProperties provisioningProps = new ProvisioningProperties(
-            null, null, null, null, "test.example.com", "https", null, null, null, null);
+            null, null, null, null, "test.example.com", "https", null, null, null, null, null);
 
     private TenantPortalService tenantPortalService;
 
diff --git a/src/test/java/net/siegeln/cameleer/saas/vendor/VendorTenantServiceTest.java b/src/test/java/net/siegeln/cameleer/saas/vendor/VendorTenantServiceTest.java
index 96aa36c..ac8476c 100644
--- a/src/test/java/net/siegeln/cameleer/saas/vendor/VendorTenantServiceTest.java
+++ b/src/test/java/net/siegeln/cameleer/saas/vendor/VendorTenantServiceTest.java
@@ -5,6 +5,7 @@ import net.siegeln.cameleer.saas.identity.LogtoConfig;
 import net.siegeln.cameleer.saas.identity.LogtoManagementClient;
 import net.siegeln.cameleer.saas.identity.ServerApiClient;
 import net.siegeln.cameleer.saas.provisioning.ProvisioningProperties;
+import net.siegeln.cameleer.saas.provisioning.TenantDataCleanupService;
 import net.siegeln.cameleer.saas.license.LicenseEntity;
 import net.siegeln.cameleer.saas.license.LicenseService;
 import net.siegeln.cameleer.saas.provisioning.ProvisionResult;
@@ -61,18 +62,21 @@ class VendorTenantServiceTest {
     @Mock
     private AuditService auditService;
 
+    @Mock
+    private TenantDataCleanupService dataCleanupService;
+
     private VendorTenantService vendorTenantService;
 
     @BeforeEach
     void setUp() {
         var provisioningProps = new ProvisioningProperties(
             "img", "uiimg", "net", "traefik", "localhost", "https",
-            "jdbc:postgresql://pg:5432/db", "https://localhost/oidc",
-            "http://logto:3001/oidc/jwks", "https://localhost");
+            "jdbc:postgresql://pg:5432/db", "jdbc:clickhouse://ch:8123/cameleer",
+            "https://localhost/oidc", "http://logto:3001/oidc/jwks", "https://localhost");
         vendorTenantService = new VendorTenantService(
                 tenantService, tenantRepository, licenseService,
                 tenantProvisioner, serverApiClient, logtoClient, logtoConfig,
-                auditService, provisioningProps);
+                auditService, provisioningProps, dataCleanupService);
     }
 
     // --- Helpers ---