feat(mysql): terminate sessions from the process list

apps/desktop/src/components/admin/ProcessListPanel.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { computed, onBeforeUnmount, onMounted, ref, watch } from "vue";
 import { useI18n } from "vue-i18n";
-import { Activity, AlertTriangle, ArrowDown, ArrowUp, Ban, Copy, Loader2, RefreshCcw, Search } from "@lucide/vue";
+import { Activity, AlertTriangle, ArrowDown, ArrowUp, Ban, Copy, Loader2, PlugZap, RefreshCcw, Search } from "@lucide/vue";
 import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { Input } from "@/components/ui/input";
@@ -54,14 +54,18 @@ let timer: ReturnType<typeof setInterval> | undefined;
 
 const cancelTarget = ref<ProcessRow | null>(null);
 const canceling = ref(false);
+const terminateTarget = ref<ProcessRow | null>(null);
+const terminating = ref(false);
 const batchSupported = computed(() => driver.value?.supportsBatchCancel === true);
+// Engines without a terminate statement only expose query cancellation.
+const terminateSupported = computed(() => typeof driver.value?.buildTerminateSessionSql === "function");
 const selectedIds = ref(new Set<number>());
 // Anchor row for Shift+click range selection, in the current display order.
 const selectionAnchorId = ref<number | null>(null);
 const batchTargets = ref<ProcessRow[] | null>(null);
 const batchResult = ref<{ succeeded: number; failures: { id: number; message: string }[] } | null>(null);
 const refreshing = ref(false);
-const actionsLocked = computed(() => canceling.value || cancelTarget.value !== null || batchTargets.value !== null);
+const actionsLocked = computed(() => canceling.value || cancelTarget.value !== null || terminating.value || terminateTarget.value !== null || batchTargets.value !== null);
 let connectionGeneration = 0;
 let disposed = false;
 const fallbackListSql = ref<string | null>(null);
@@ -307,6 +311,62 @@ async function confirmCancel() {
   }
 }
 
+function requestTerminate(row: ProcessRow) {
+  if (isOwnSession(row) || actionsLocked.value || refreshing.value || !terminateSupported.value) return;
+  terminateTarget.value = row;
+}
+
+/**
+ * Close the session itself. `KILL QUERY` / `pg_cancel_backend` leave an idle session
+ * connected, so an idle row could never be removed from the list before this action.
+ */
+async function confirmTerminate() {
+  const target = terminateTarget.value;
+  const activeDriver = driver.value;
+  const buildTerminateSql = activeDriver?.buildTerminateSessionSql;
+  if (!target || !activeDriver || !buildTerminateSql || terminating.value) return;
+  const connection = { ...props.connection };
+  const generation = connectionGeneration;
+  const isCurrent = () => !disposed && generation === connectionGeneration;
+  terminating.value = true;
+  try {
+    const terminateSql = buildTerminateSql.call(activeDriver, target.id);
+    let usedFallbackTerminateSql = false;
+    const executeTerminateSql = async (sql: string) => {
+      if (!isCurrent()) return undefined;
+      const results = await api.executeMulti(connection.id, "", sql, undefined, undefined, { maxRows: 1 });
+      const executionError = processListExecutionError(results);
+      if (executionError) throw new Error(executionError);
+      return results;
+    };
+    const result = await executeWithProductionSqlGuard({
+      connection,
+      database: "",
+      sql: terminateSql,
+      source: t("production.sourceAdmin"),
+      execute: async () => {
+        try {
+          return await executeTerminateSql(terminateSql);
+        } catch (error) {
+          if (!activeDriver.buildFallbackTerminateSessionSql || !activeDriver.shouldUseFallbackTerminateSessionSql?.(error)) throw error;
+          usedFallbackTerminateSql = true;
+          return executeTerminateSql(activeDriver.buildFallbackTerminateSessionSql(target.id));
+        }
+      },
+    });
+    if (result === undefined || !isCurrent()) return;
+    const terminateResultError = usedFallbackTerminateSql ? activeDriver.fallbackTerminateSessionResultError?.(result) : activeDriver.terminateSessionResultError?.(result);
+    if (terminateResultError) throw new Error(terminateResultError);
+    toast(t("processList.terminateSuccess", { id: target.id }), 2500);
+    terminateTarget.value = null;
+  } catch (error: any) {
+    if (isCurrent()) toast(t("processList.terminateFailed", { message: error?.message || String(error) }), 5000);
+  } finally {
+    terminating.value = false;
+    if (terminateTarget.value === null) void load({ silent: true });
+  }
+}
+
 function stopTimer() {
   if (timer) {
     clearInterval(timer);
@@ -433,7 +493,7 @@ onBeforeUnmount(() => {
                 <ArrowDown v-else-if="sortKey === column.key && sortDir === 'desc'" class="h-3 w-3" />
               </span>
             </th>
-            <th class="w-16 whitespace-nowrap border-b px-3 py-2 text-right font-medium">{{ t("processList.colActions") }}</th>
+            <th class="w-40 whitespace-nowrap border-b px-3 py-2 text-right font-medium">{{ t("processList.colActions") }}</th>
           </tr>
         </thead>
         <tbody>
@@ -463,17 +523,31 @@ onBeforeUnmount(() => {
               <template v-else>{{ row[column.key] === null || row[column.key] === undefined ? "—" : row[column.key] }}</template>
             </td>
             <td class="px-3 py-1.5 text-right">
-              <Button
-                variant="ghost"
-                size="sm"
-                class="h-6 gap-1 px-1.5 text-[11px] text-destructive hover:bg-destructive/10 hover:text-destructive disabled:opacity-40"
-                :disabled="isOwnSession(row) || actionsLocked || refreshing"
-                :title="isOwnSession(row) ? t('processList.cannotKillSelf') : t('processList.kill')"
-                @click="requestCancel(row)"
-              >
-                <Ban class="h-3.5 w-3.5" />
-                {{ t("processList.kill") }}
-              </Button>
+              <span class="inline-flex items-center justify-end gap-1">
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  class="h-6 gap-1 px-1.5 text-[11px] text-destructive hover:bg-destructive/10 hover:text-destructive disabled:opacity-40"
+                  :disabled="isOwnSession(row) || actionsLocked || refreshing"
+                  :title="isOwnSession(row) ? t('processList.cannotKillSelf') : t('processList.kill')"
+                  @click="requestCancel(row)"
+                >
+                  <Ban class="h-3.5 w-3.5" />
+                  {{ t("processList.kill") }}
+                </Button>
+                <Button
+                  v-if="terminateSupported"
+                  variant="ghost"
+                  size="sm"
+                  class="h-6 gap-1 px-1.5 text-[11px] text-destructive hover:bg-destructive/10 hover:text-destructive disabled:opacity-40"
+                  :disabled="isOwnSession(row) || actionsLocked || refreshing"
+                  :title="isOwnSession(row) ? t('processList.cannotTerminateSelf') : t('processList.terminate')"
+                  @click="requestTerminate(row)"
+                >
+                  <PlugZap class="h-3.5 w-3.5" />
+                  {{ t("processList.terminate") }}
+                </Button>
+              </span>
             </td>
           </tr>
           <tr v-if="!loading && filteredRows.length === 0">
@@ -513,6 +587,34 @@ onBeforeUnmount(() => {
       </DialogContent>
     </Dialog>
 
+    <Dialog
+      :open="terminateTarget !== null"
+      @update:open="
+        (open) => {
+          if (!open && !terminating) terminateTarget = null;
+        }
+      "
+    >
+      <DialogContent class="max-w-sm" :show-close-button="!terminating">
+        <DialogHeader>
+          <DialogTitle class="flex items-center gap-2">
+            <AlertTriangle class="h-4 w-4 text-destructive" />
+            {{ t("processList.terminateTitle") }}
+          </DialogTitle>
+        </DialogHeader>
+        <p v-if="terminateTarget" class="text-sm text-muted-foreground">
+          {{ t("processList.terminateConfirm", { id: terminateTarget.id, user: terminateTarget.user }) }}
+        </p>
+        <DialogFooter>
+          <Button variant="outline" :disabled="terminating" @click="terminateTarget = null">{{ t("dangerDialog.cancel") }}</Button>
+          <Button variant="destructive" :disabled="terminating" @click="confirmTerminate">
+            <Loader2 v-if="terminating" class="mr-1.5 h-3.5 w-3.5 animate-spin" />
+            {{ t("processList.terminate") }}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+
     <Dialog
       :open="batchTargets !== null"
       @update:open="

apps/desktop/src/i18n/locales/az.ts

@@ -3850,6 +3850,12 @@ export default withEnglishFallback({
     killConfirm: "{id} ({user}) sessiyasında icra olunan sorğu ləğv edilsin? Sessiyanın əlaqəsi saxlanacaq.",
     killSuccess: "{id} sessiyasında icra olunan sorğu ləğv edildi",
     killFailed: "Sorğunu ləğv etmək mümkün olmadı: {message}",
+    terminate: "Sessiyanı sonlandır",
+    cannotTerminateSelf: "Öz sessiyanızı sonlandıra bilməzsiniz",
+    terminateTitle: "Sessiyanı sonlandır",
+    terminateConfirm: "{id} ({user}) sessiyası sonlandırılsın? Əlaqə dərhal bağlanır və təsdiqlənməmiş tranzaksiyalar geri alınır.",
+    terminateSuccess: "{id} sessiyası sonlandırıldı",
+    terminateFailed: "Sessiyanı sonlandırmaq mümkün olmadı: {message}",
     previewTitle: "İfadə",
     copy: "Kopyala",
     copied: "Kopyalandı",

apps/desktop/src/i18n/locales/en.ts

@@ -4048,6 +4048,12 @@ export default {
     killConfirm: "Cancel the running query for session {id} ({user})? The session will remain connected.",
     killSuccess: "Canceled the running query for session {id}",
     killFailed: "Failed to cancel query: {message}",
+    terminate: "Terminate session",
+    cannotTerminateSelf: "You cannot terminate your own session",
+    terminateTitle: "Terminate session",
+    terminateConfirm: "Terminate session {id} ({user})? The connection is closed immediately and any uncommitted transaction is rolled back.",
+    terminateSuccess: "Terminated session {id}",
+    terminateFailed: "Failed to terminate session: {message}",
     previewTitle: "Statement",
     copy: "Copy",
     copied: "Copied",

apps/desktop/src/i18n/locales/es.ts

@@ -9538,6 +9538,12 @@ export default withEnglishFallback({
     killConfirm: "¿Cancelar la consulta en ejecución de la sesión {id} ({user})? La sesión permanecerá conectada.",
     killSuccess: "Consulta en ejecución de la sesión {id} cancelada",
     killFailed: "Error al cancelar la consulta: {message}",
+    terminate: "Terminar sesión",
+    cannotTerminateSelf: "No se puede terminar la sesión actual",
+    terminateTitle: "Terminar sesión",
+    terminateConfirm: "¿Terminar la sesión {id} ({user})? La conexión se cierra de inmediato y cualquier transacción sin confirmar se revierte.",
+    terminateSuccess: "Sesión {id} terminada",
+    terminateFailed: "Error al terminar la sesión: {message}",
     colPid: "PID",
     colClient: "Cliente",
     colApp: "Aplicación",

apps/desktop/src/i18n/locales/it.ts

@@ -9538,6 +9538,12 @@ export default withEnglishFallback({
     killConfirm: "Annullare la query in esecuzione della sessione {id} ({user})? La sessione resterà connessa.",
     killSuccess: "Query in esecuzione della sessione {id} annullata",
     killFailed: "Impossibile annullare la query: {message}",
+    terminate: "Termina sessione",
+    cannotTerminateSelf: "Impossibile terminare la sessione corrente",
+    terminateTitle: "Termina sessione",
+    terminateConfirm: "Terminare la sessione {id} ({user})? La connessione viene chiusa immediatamente e le transazioni non confermate vengono annullate.",
+    terminateSuccess: "Sessione {id} terminata",
+    terminateFailed: "Impossibile terminare la sessione: {message}",
     colPid: "PID",
     colClient: "Client",
     colApp: "Applicazione",

apps/desktop/src/i18n/locales/ja.ts

@@ -9588,6 +9588,12 @@ export default withEnglishFallback({
     killConfirm: "セッション {id}（{user}）で実行中のクエリをキャンセルしますか？セッションの接続は維持されます。",
     killSuccess: "セッション {id} で実行中のクエリをキャンセルしました。",
     killFailed: "クエリのキャンセルに失敗しました：{message}",
+    terminate: "セッションを終了",
+    cannotTerminateSelf: "現在のセッションは終了できません",
+    terminateTitle: "セッションを終了",
+    terminateConfirm: "セッション {id}（{user}）を終了しますか？接続は直ちに切断され、未コミットのトランザクションはロールバックされます。",
+    terminateSuccess: "セッション {id} を終了しました。",
+    terminateFailed: "セッションの終了に失敗しました：{message}",
     colPid: "PID",
     colClient: "クライアント",
     colApp: "アプリケーション",

apps/desktop/src/i18n/locales/ko.ts

@@ -3812,6 +3812,12 @@ export default withEnglishFallback({
     killConfirm: "세션 {id} ({user})에서 실행 중인 쿼리를 취소하시겠습니까? 세션 연결은 유지됩니다.",
     killSuccess: "세션 {id}에서 실행 중인 쿼리를 취소했습니다",
     killFailed: "쿼리 취소에 실패했습니다: {message}",
+    terminate: "세션 종료",
+    cannotTerminateSelf: "현재 세션은 종료할 수 없습니다",
+    terminateTitle: "세션 종료",
+    terminateConfirm: "세션 {id} ({user})을(를) 종료하시겠습니까? 연결이 즉시 끊기고 커밋되지 않은 트랜잭션은 롤백됩니다.",
+    terminateSuccess: "세션 {id}을(를) 종료했습니다",
+    terminateFailed: "세션 종료에 실패했습니다: {message}",
     previewTitle: "구문",
     copy: "복사",
     copied: "복사했습니다",

apps/desktop/src/i18n/locales/pt-BR.ts

@@ -9539,6 +9539,12 @@ export default withEnglishFallback({
     killConfirm: "Cancelar a consulta em execução da sessão {id} ({user})? A sessão permanecerá conectada.",
     killSuccess: "Consulta em execução da sessão {id} cancelada.",
     killFailed: "Falha ao cancelar a consulta: {message}",
+    terminate: "Encerrar sessão",
+    cannotTerminateSelf: "Não é possível encerrar a sessão atual",
+    terminateTitle: "Encerrar sessão",
+    terminateConfirm: "Encerrar a sessão {id} ({user})? A conexão é fechada imediatamente e qualquer transação não confirmada é revertida.",
+    terminateSuccess: "Sessão {id} encerrada",
+    terminateFailed: "Falha ao encerrar a sessão: {message}",
     colPid: "PID",
     colClient: "Cliente",
     colApp: "Aplicativo",

apps/desktop/src/i18n/locales/tr.ts

@@ -3822,6 +3822,12 @@ export default withEnglishFallback({
     killConfirm: "{id} ({user}) oturumundaki çalışan sorgu iptal edilsin mi? Oturum bağlı kalmaya devam eder.",
     killSuccess: "{id} oturumundaki çalışan sorgu iptal edildi",
     killFailed: "Sorgu iptal edilemedi: {message}",
+    terminate: "Oturumu sonlandır",
+    cannotTerminateSelf: "Kendi oturumunuzu sonlandıramazsınız",
+    terminateTitle: "Oturumu sonlandır",
+    terminateConfirm: "{id} ({user}) oturumu sonlandırılsın mı? Bağlantı hemen kapatılır ve işlenmemiş işlemler geri alınır.",
+    terminateSuccess: "{id} oturumu sonlandırıldı",
+    terminateFailed: "Oturum sonlandırılamadı: {message}",
     previewTitle: "İfade",
     copy: "Kopyala",
     copied: "Kopyalandı",

apps/desktop/src/i18n/locales/zh-CN.ts

@@ -3958,6 +3958,12 @@ export default withEnglishFallback({
     killConfirm: "确定取消会话 {id}（{user}）中正在运行的查询？该会话将保持连接。",
     killSuccess: "已取消会话 {id} 中正在运行的查询",
     killFailed: "取消查询失败：{message}",
+    terminate: "终止会话",
+    cannotTerminateSelf: "无法终止当前会话",
+    terminateTitle: "终止会话",
+    terminateConfirm: "确定终止会话 {id}（{user}）？该连接会立即断开，未提交的事务将回滚。",
+    terminateSuccess: "已终止会话 {id}",
+    terminateFailed: "终止会话失败：{message}",
     previewTitle: "语句",
     copy: "复制",
     copied: "已复制",

apps/desktop/src/i18n/locales/zh-TW.ts

@@ -9537,6 +9537,12 @@ export default withEnglishFallback({
     killConfirm: "確定取消會話 {id}（{user}）中執行中的查詢？該會話將保持連線。",
     killSuccess: "已取消會話 {id} 中執行中的查詢",
     killFailed: "取消查詢失敗：{message}",
+    terminate: "終止會話",
+    cannotTerminateSelf: "無法終止目前會話",
+    terminateTitle: "終止會話",
+    terminateConfirm: "確定終止會話 {id}（{user}）？該連線會立即中斷，未提交的交易將回滾。",
+    terminateSuccess: "已終止會話 {id}",
+    terminateFailed: "終止會話失敗：{message}",
     colPid: "PID",
     colClient: "用戶端",
     colApp: "應用程式",

apps/desktop/src/lib/__tests__/database/mysqlProcessList.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 import type { QueryResult } from "@/types/database";
-import { buildCancelQuerySql, clampInterval, createProcessListLoadCoordinator, mapProcessRows, processListExecutionError, processListSessionCount, supportsProcessList } from "@/lib/database/mysqlProcessList";
+import { buildCancelQuerySql, buildTerminateSessionSql, clampInterval, createProcessListLoadCoordinator, mapProcessRows, processListExecutionError, processListSessionCount, supportsProcessList } from "@/lib/database/mysqlProcessList";
 
 function result(columns: string[], rows: (string | number | boolean | null)[][]): QueryResult {
   return { columns, rows, affected_rows: 0, execution_time_ms: 0 };
@@ -48,6 +48,19 @@ describe("buildCancelQuerySql", () => {
   });
 });
 
+describe("buildTerminateSessionSql", () => {
+  it("builds KILL for a valid id so an idle session is really disconnected", () => {
+    expect(buildTerminateSessionSql(8213)).toBe("KILL 8213");
+  });
+
+  it("rejects non-integer or nonpositive ids", () => {
+    expect(() => buildTerminateSessionSql(1.5)).toThrow();
+    expect(() => buildTerminateSessionSql(0)).toThrow();
+    expect(() => buildTerminateSessionSql(-1)).toThrow();
+    expect(() => buildTerminateSessionSql(Number.NaN)).toThrow();
+  });
+});
+
 describe("clampInterval", () => {
   it("clamps below the minimum to 1 second", () => {
     expect(clampInterval(0)).toBe(1);

apps/desktop/src/lib/__tests__/database/postgresProcessList.spec.ts

@@ -3,10 +3,14 @@ import type { QueryResult } from "@/types/database";
 import {
   buildKingbaseCancelQuerySql,
   buildKingbasePgCancelQuerySql,
+  buildKingbasePgTerminateSessionSql,
+  buildKingbaseTerminateSessionSql,
   buildPgCancelQuerySql,
+  buildPgTerminateSessionSql,
   isKingbaseOwnSessionCatalogCompatibilityError,
   isKingbaseProcessListCatalogCompatibilityError,
   isKingbaseCancelCatalogCompatibilityError,
+  isKingbaseTerminateCatalogCompatibilityError,
   isPgProcessListCompatibilityError,
   KINGBASE_OWN_SESSION_SQL,
   KINGBASE_PG_OWN_SESSION_SQL,
@@ -18,6 +22,7 @@ import {
   kingbaseCancelQueryResultError,
   kingbasePgCancelQueryResultError,
   pgCancelQueryResultError,
+  pgTerminateSessionResultError,
   PG_PROCESS_LIST_LEGACY_SQL,
   PG_PROCESS_LIST_SQL,
 } from "@/lib/database/postgresProcessList";
@@ -120,6 +125,32 @@ describe("PostgreSQL-family process SQL", () => {
   });
 });
 
+describe("session termination statements", () => {
+  it("builds pg_terminate_backend so an idle backend is really disconnected", () => {
+    expect(buildPgTerminateSessionSql(4211)).toBe("SELECT pg_terminate_backend(4211)");
+    expect(buildKingbaseTerminateSessionSql(4211)).toBe("SELECT sys_terminate_backend(4211)");
+    expect(buildKingbasePgTerminateSessionSql(4211)).toBe("SELECT pg_terminate_backend(4211)");
+  });
+
+  it("rejects non-integer or nonpositive pids", () => {
+    expect(() => buildPgTerminateSessionSql(1.5)).toThrow();
+    expect(() => buildPgTerminateSessionSql(0)).toThrow();
+    expect(() => buildPgTerminateSessionSql(Number.NaN)).toThrow();
+  });
+
+  it("requires the server to confirm that a backend was terminated", () => {
+    expect(pgTerminateSessionResultError([result(["pg_terminate_backend"], [[true]])])).toBeNull();
+    expect(pgTerminateSessionResultError([result(["pg_terminate_backend"], [["t"]])])).toBeNull();
+    expect(pgTerminateSessionResultError([result(["pg_terminate_backend"], [[false]])])).toContain("did not terminate");
+    expect(pgTerminateSessionResultError([result(["pg_terminate_backend"], [])])).toContain("did not terminate");
+  });
+
+  it("detects the Kingbase fallback trigger for a missing sys_terminate_backend", () => {
+    expect(isKingbaseTerminateCatalogCompatibilityError(new Error("function sys_terminate_backend(integer) does not exist"))).toBe(true);
+    expect(isKingbaseTerminateCatalogCompatibilityError(new Error("permission denied"))).toBe(false);
+  });
+});
+
 describe("Postgres compatibility", () => {
   it("provides a pre-9.6 query and only falls back for missing wait-event columns", () => {
     expect(PG_PROCESS_LIST_SQL).toContain("wait_event_type");
@@ -145,7 +176,10 @@ describe("resolveProcessListDriver", () => {
     const mysql = resolveProcessListDriver("mysql");
     const postgres = resolveProcessListDriver("postgres");
     expect(mysql?.buildCancelQuerySql(7)).toBe("KILL QUERY 7");
+    expect(mysql?.buildTerminateSessionSql?.(7)).toBe("KILL 7");
     expect(postgres?.buildCancelQuerySql(7)).toBe("SELECT pg_cancel_backend(7)");
+    expect(postgres?.buildTerminateSessionSql?.(7)).toBe("SELECT pg_terminate_backend(7)");
+    expect(postgres?.terminateSessionResultError?.([result(["pg_terminate_backend"], [[false]])])).toContain("did not terminate");
     expect(postgres?.fallbackListSql).toBe(PG_PROCESS_LIST_LEGACY_SQL);
     expect(postgres?.shouldUseFallbackListSql?.(new Error('column "wait_event" does not exist'))).toBe(true);
     expect(postgres?.cancelQueryResultError?.([result(["pg_cancel_backend"], [[false]])])).toContain("did not cancel");
@@ -177,6 +211,8 @@ describe("connectionSupportsProcessList", () => {
     expect(connectionSupportsProcessList(conn({ db_type: "gaussdb", driver_profile: "opengauss" }))).toBe(true);
     expect(connectionSupportsProcessList(conn({ db_type: "gaussdb", driver_profile: "gaussdb" }))).toBe(false);
     expect(connectionSupportsProcessList(conn({ db_type: "kingbase" }))).toBe(true);
+    expect(resolveProcessListDriver("kingbase")?.buildTerminateSessionSql?.(7)).toBe("SELECT sys_terminate_backend(7)");
+    expect(resolveProcessListDriver("opengauss")?.buildTerminateSessionSql?.(7)).toBe("SELECT pg_terminate_backend(7)");
     expect(connectionSupportsProcessList(conn({ db_type: "sqlite" }))).toBe(false);
     expect(connectionSupportsProcessList(undefined)).toBe(false);
   });

apps/desktop/src/lib/database/mysqlProcessList.ts

@@ -137,6 +137,21 @@ export function buildCancelQuerySql(id: number): string {
   return `KILL QUERY ${id}`;
 }
 
+/**
+ * Build the `KILL <id>` statement that disconnects the session itself.
+ *
+ * `KILL QUERY` only interrupts the statement running at that instant, so an idle
+ * (`Sleep`) session survives it and keeps showing up in the process list. When the
+ * user asks to close a session, only this statement actually removes it (and rolls
+ * back the session's uncommitted transaction, the same as the server-side `KILL`).
+ */
+export function buildTerminateSessionSql(id: number): string {
+  if (!Number.isInteger(id) || id <= 0) {
+    throw new Error(`Invalid session id: ${id}`);
+  }
+  return `KILL ${id}`;
+}
+
 /** Clamp a user-entered refresh interval to a safe integer range of seconds. */
 export function clampInterval(seconds: number): number {
   if (!Number.isFinite(seconds)) return DEFAULT_REFRESH_SECONDS;

apps/desktop/src/lib/database/postgresProcessList.ts

@@ -174,6 +174,27 @@ export function buildKingbasePgCancelQuerySql(pid: number): string {
   return `SELECT pg_cancel_backend(${pid})`;
 }
 
+/**
+ * Build the statement that disconnects the backend instead of only interrupting the
+ * statement it is running right now. `pg_cancel_backend` cancels the current query and
+ * leaves an idle backend alive, so the process list keeps listing it; terminating the
+ * backend is what actually removes the session (rolling back its open transaction).
+ */
+export function buildPgTerminateSessionSql(pid: number): string {
+  validateBackendPid(pid);
+  return `SELECT pg_terminate_backend(${pid})`;
+}
+
+export function buildKingbaseTerminateSessionSql(pid: number): string {
+  validateBackendPid(pid);
+  return `SELECT sys_terminate_backend(${pid})`;
+}
+
+export function buildKingbasePgTerminateSessionSql(pid: number): string {
+  validateBackendPid(pid);
+  return `SELECT pg_terminate_backend(${pid})`;
+}
+
 /** Return an error when PostgreSQL reports that no running query was canceled. */
 export function pgCancelQueryResultError(results: QueryResult[]): string | null {
   return backendCancelQueryResultError(results, "pg_cancel_backend");
@@ -187,11 +208,24 @@ export function kingbasePgCancelQueryResultError(results: QueryResult[]): string
   return backendCancelQueryResultError(results, "pg_cancel_backend");
 }
 
-function backendCancelQueryResultError(results: QueryResult[], functionName: string): string | null {
+/** Return an error when the server reports that no backend was terminated. */
+export function pgTerminateSessionResultError(results: QueryResult[]): string | null {
+  return backendCancelQueryResultError(results, "pg_terminate_backend", "did not terminate the session");
+}
+
+export function kingbaseTerminateSessionResultError(results: QueryResult[]): string | null {
+  return backendCancelQueryResultError(results, "sys_terminate_backend", "did not terminate the session");
+}
+
+export function kingbasePgTerminateSessionResultError(results: QueryResult[]): string | null {
+  return backendCancelQueryResultError(results, "pg_terminate_backend", "did not terminate the session");
+}
+
+function backendCancelQueryResultError(results: QueryResult[], functionName: string, failure = "did not cancel a running query"): string | null {
   const result = results.find((item) => item.execution_error !== true);
   const value = result?.rows?.[0]?.[0];
   if (value === true || value === 1 || String(value).toLowerCase() === "t" || String(value).toLowerCase() === "true") return null;
-  return `${functionName} did not cancel a running query`;
+  return `${functionName} ${failure}`;
 }
 
 /** Detect the undefined-column failure produced by pre-9.6 pg_stat_activity. */
@@ -213,3 +247,7 @@ export function isKingbaseOwnSessionCatalogCompatibilityError(error: unknown): b
 export function isKingbaseCancelCatalogCompatibilityError(error: unknown): boolean {
   return isMissingKingbaseSysFunction(error, ["sys_cancel_backend"]);
 }
+
+export function isKingbaseTerminateCatalogCompatibilityError(error: unknown): boolean {
+  return isMissingKingbaseSysFunction(error, ["sys_terminate_backend"]);
+}

apps/desktop/src/lib/database/processListDrivers.ts

@@ -1,16 +1,22 @@
 import type { ConnectionConfig, DatabaseType, QueryResult } from "@/types/database";
 import { effectiveDatabaseTypeForConnection } from "@/lib/database/jdbcDialect";
-import { buildCancelQuerySql as buildMysqlCancelQuerySql, mapProcessRows as mapMysqlProcessRows, PROCESS_LIST_SQL as MYSQL_PROCESS_LIST_SQL, supportsProcessList as supportsMysqlProcessList } from "./mysqlProcessList";
+import { buildCancelQuerySql as buildMysqlCancelQuerySql, buildTerminateSessionSql as buildMysqlTerminateSessionSql, mapProcessRows as mapMysqlProcessRows, PROCESS_LIST_SQL as MYSQL_PROCESS_LIST_SQL, supportsProcessList as supportsMysqlProcessList } from "./mysqlProcessList";
 import {
   buildKingbaseCancelQuerySql,
   buildKingbasePgCancelQuerySql,
+  buildKingbasePgTerminateSessionSql,
+  buildKingbaseTerminateSessionSql,
   buildPgCancelQuerySql,
+  buildPgTerminateSessionSql,
   isKingbaseOwnSessionCatalogCompatibilityError,
   isKingbaseProcessListCatalogCompatibilityError,
   isKingbaseCancelCatalogCompatibilityError,
+  isKingbaseTerminateCatalogCompatibilityError,
   isPgProcessListCompatibilityError,
   kingbaseCancelQueryResultError,
   kingbasePgCancelQueryResultError,
+  kingbasePgTerminateSessionResultError,
+  kingbaseTerminateSessionResultError,
   KINGBASE_OWN_SESSION_SQL,
   KINGBASE_PG_OWN_SESSION_SQL,
   KINGBASE_PG_PROCESS_LIST_SQL,
@@ -19,6 +25,7 @@ import {
   OPENGAUSS_OWN_SESSION_SQL,
   OPENGAUSS_PROCESS_LIST_SQL,
   pgCancelQueryResultError,
+  pgTerminateSessionResultError,
   PG_OWN_SESSION_SQL,
   PG_PROCESS_LIST_LEGACY_SQL,
   PG_PROCESS_LIST_SQL,
@@ -79,6 +86,19 @@ export interface ProcessListDriver {
   cancelQueryResultError?(results: QueryResult[]): string | null;
   /** Validate the success value returned by the compatibility cancellation statement. */
   fallbackCancelQueryResultError?(results: QueryResult[]): string | null;
+  /**
+   * Build the validated statement that disconnects the session. Engines that omit it
+   * only offer query cancellation, because they cannot close a session over the wire.
+   */
+  buildTerminateSessionSql?(id: number): string;
+  /** Build the compatibility statement used when the primary terminate function is unavailable. */
+  buildFallbackTerminateSessionSql?(id: number): string;
+  /** Restrict terminate fallback attempts to known compatibility failures. */
+  shouldUseFallbackTerminateSessionSql?(error: unknown): boolean;
+  /** Validate any engine-specific success value returned by the terminate statement. */
+  terminateSessionResultError?(results: QueryResult[]): string | null;
+  /** Validate the success value returned by the compatibility terminate statement. */
+  fallbackTerminateSessionResultError?(results: QueryResult[]): string | null;
 }
 
 const MYSQL_COLUMNS: ProcessColumn[] = [
@@ -114,6 +134,7 @@ const MYSQL_DRIVER: ProcessListDriver = {
   // Typed structs carry no index signature; they are plain string-keyed objects at runtime.
   mapRows: (result) => mapMysqlProcessRows(result) as unknown as ProcessRow[],
   buildCancelQuerySql: buildMysqlCancelQuerySql,
+  buildTerminateSessionSql: buildMysqlTerminateSessionSql,
 };
 
 const POSTGRES_DRIVER: ProcessListDriver = {
@@ -127,6 +148,8 @@ const POSTGRES_DRIVER: ProcessListDriver = {
   mapRows: (result) => mapPgProcessRows(result) as unknown as ProcessRow[],
   buildCancelQuerySql: buildPgCancelQuerySql,
   cancelQueryResultError: pgCancelQueryResultError,
+  buildTerminateSessionSql: buildPgTerminateSessionSql,
+  terminateSessionResultError: pgTerminateSessionResultError,
 };
 
 const OPENGAUSS_DRIVER: ProcessListDriver = {
@@ -138,6 +161,8 @@ const OPENGAUSS_DRIVER: ProcessListDriver = {
   mapRows: (result) => mapPgProcessRows(result) as unknown as ProcessRow[],
   buildCancelQuerySql: buildPgCancelQuerySql,
   cancelQueryResultError: pgCancelQueryResultError,
+  buildTerminateSessionSql: buildPgTerminateSessionSql,
+  terminateSessionResultError: pgTerminateSessionResultError,
 };
 
 const KINGBASE_DRIVER: ProcessListDriver = {
@@ -156,6 +181,11 @@ const KINGBASE_DRIVER: ProcessListDriver = {
   shouldUseFallbackCancelQuerySql: isKingbaseCancelCatalogCompatibilityError,
   cancelQueryResultError: kingbaseCancelQueryResultError,
   fallbackCancelQueryResultError: kingbasePgCancelQueryResultError,
+  buildTerminateSessionSql: buildKingbaseTerminateSessionSql,
+  buildFallbackTerminateSessionSql: buildKingbasePgTerminateSessionSql,
+  shouldUseFallbackTerminateSessionSql: isKingbaseTerminateCatalogCompatibilityError,
+  terminateSessionResultError: kingbaseTerminateSessionResultError,
+  fallbackTerminateSessionResultError: kingbasePgTerminateSessionResultError,
 };
 
 /** Resolve the process-list driver for a connection, or null if unsupported. */