.github/workflows/docker-release.yml

@@ -0,0 +1,91 @@
+name: Docker Publish (Release)
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Version tag to publish (e.g. 0.1.2 or v0.1.2)"
+        required: false
+        type: string
+
+jobs:
+  publish:
+    name: Build and Push Docker Images
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    env:
+      # Optional repo variable. If unset, DOCKERHUB_USERNAME is used.
+      IMAGE_NAMESPACE: ${{ vars.DOCKERHUB_NAMESPACE }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Resolve version/tag
+        id: ver
+        shell: bash
+        run: |
+          RAW_TAG="${{ github.event.release.tag_name }}"
+          if [ -z "$RAW_TAG" ]; then
+            RAW_TAG="${{ inputs.version }}"
+          fi
+          if [ -z "$RAW_TAG" ]; then
+            RAW_TAG="${GITHUB_REF_NAME}"
+          fi
+
+          CLEAN_TAG="${RAW_TAG#v}"
+          echo "raw=$RAW_TAG" >> "$GITHUB_OUTPUT"
+          echo "clean=$CLEAN_TAG" >> "$GITHUB_OUTPUT"
+
+      - name: Set image namespace
+        id: ns
+        shell: bash
+        run: |
+          NS="${IMAGE_NAMESPACE}"
+          if [ -z "$NS" ]; then
+            NS="${{ secrets.DOCKERHUB_USERNAME }}"
+          fi
+          if [ -z "$NS" ]; then
+            echo "Missing Docker Hub namespace. Set repo var DOCKERHUB_NAMESPACE or secret DOCKERHUB_USERNAME."
+            exit 1
+          fi
+          echo "value=$NS" >> "$GITHUB_OUTPUT"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push backend image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./backend
+          file: ./backend/Dockerfile
+          push: true
+          tags: |
+            ${{ steps.ns.outputs.value }}/nexapg-backend:${{ steps.ver.outputs.clean }}
+            ${{ steps.ns.outputs.value }}/nexapg-backend:latest
+          cache-from: type=registry,ref=${{ steps.ns.outputs.value }}/nexapg-backend:buildcache
+          cache-to: type=registry,ref=${{ steps.ns.outputs.value }}/nexapg-backend:buildcache,mode=max
+
+      - name: Build and push frontend image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./frontend
+          file: ./frontend/Dockerfile
+          push: true
+          build-args: |
+            VITE_API_URL=/api/v1
+          tags: |
+            ${{ steps.ns.outputs.value }}/nexapg-frontend:${{ steps.ver.outputs.clean }}
+            ${{ steps.ns.outputs.value }}/nexapg-frontend:latest
+          cache-from: type=registry,ref=${{ steps.ns.outputs.value }}/nexapg-frontend:buildcache
+          cache-to: type=registry,ref=${{ steps.ns.outputs.value }}/nexapg-frontend:buildcache,mode=max

backend/app/core/config.py

@@ -2,7 +2,7 @@ from functools import lru_cache
 from pydantic import field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
-NEXAPG_VERSION = "0.1.2"
+NEXAPG_VERSION = "0.1.3"
 
 
 class Settings(BaseSettings):

backend/app/services/infra_probe.py

@@ -17,10 +17,10 @@ class DiskSpaceProvider:
 class NullDiskSpaceProvider(DiskSpaceProvider):
     async def get_free_bytes(self, target_host: str) -> DiskSpaceProbeResult:
         return DiskSpaceProbeResult(
-            source="none",
+            source="agentless",
             status="unavailable",
             free_bytes=None,
-            message=f"No infra probe configured for host {target_host}. Add SSH/Agent provider later.",
+            message=f"Agentless mode: host-level free disk is not available for {target_host}.",
         )
 
 

frontend/src/pages/QueryInsightsPage.jsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from "react";
+import React, { useEffect, useRef, useState } from "react";
 import { apiFetch } from "../api";
 import { useAuth } from "../state";
 
@@ -62,6 +62,7 @@ function buildQueryTips(row) {
 
 export function QueryInsightsPage() {
   const { tokens, refresh } = useAuth();
+  const refreshRef = useRef(refresh);
   const [targets, setTargets] = useState([]);
   const [targetId, setTargetId] = useState("");
   const [rows, setRows] = useState([]);
@@ -71,6 +72,10 @@ export function QueryInsightsPage() {
   const [error, setError] = useState("");
   const [loading, setLoading] = useState(true);
 
+  useEffect(() => {
+    refreshRef.current = refresh;
+  }, [refresh]);
+
   useEffect(() => {
     (async () => {
       try {
@@ -89,17 +94,26 @@ export function QueryInsightsPage() {
 
   useEffect(() => {
     if (!targetId) return;
+    let active = true;
     (async () => {
       try {
-        const data = await apiFetch(`/targets/${targetId}/top-queries`, {}, tokens, refresh);
+        const data = await apiFetch(`/targets/${targetId}/top-queries`, {}, tokens, refreshRef.current);
+        if (!active) return;
         setRows(data);
-        setSelectedQuery(data[0] || null);
+        setSelectedQuery((prev) => {
-        setPage(1);
+          if (!prev) return data[0] || null;
+          const keep = data.find((row) => row.queryid === prev.queryid);
+          return keep || data[0] || null;
+        });
+        setPage((prev) => (prev === 1 ? prev : 1));
       } catch (e) {
-        setError(String(e.message || e));
+        if (active) setError(String(e.message || e));
       }
     })();
-  }, [targetId, tokens, refresh]);
+    return () => {
+      active = false;
+    };
+  }, [targetId, tokens?.accessToken, tokens?.refreshToken]);
 
   const dedupedByQueryId = [...rows].reduce((acc, row) => {
     if (!row?.queryid) return acc;

frontend/src/pages/TargetDetailPage.jsx

@@ -41,6 +41,19 @@ function formatNumber(value, digits = 2) {
   return Number(value).toFixed(digits);
 }
 
+function formatHostMetricUnavailable() {
+  return "N/A (agentless)";
+}
+
+function formatDiskSpaceAgentless(diskSpace) {
+  if (!diskSpace) return formatHostMetricUnavailable();
+  if (diskSpace.free_bytes !== null && diskSpace.free_bytes !== undefined) {
+    return formatBytes(diskSpace.free_bytes);
+  }
+  if (diskSpace.status === "unavailable") return formatHostMetricUnavailable();
+  return "-";
+}
+
 function MetricsTooltip({ active, payload, label }) {
   if (!active || !payload || payload.length === 0) return null;
   const row = payload[0]?.payload || {};
@@ -346,6 +359,9 @@ export function TargetDetailPage() {
       {uiMode === "dba" && overview && (
         <div className="card">
           <h3>Database Overview</h3>
+          <p className="muted" style={{ marginTop: 2 }}>
+            Agentless mode: host-level CPU, RAM, and free-disk metrics are not available.
+          </p>
           <div className="grid three overview-kv">
             <div><span>PostgreSQL Version</span><strong>{overview.instance.server_version || "-"}</strong></div>
             <div>
@@ -366,8 +382,8 @@ export function TargetDetailPage() {
             <div title="Total WAL directory size (when available)">
               <span>WAL Size</span><strong>{formatBytes(overview.storage.wal_directory_size_bytes)}</strong>
             </div>
-            <div title="Optional metric via future Agent/SSH provider">
+            <div title={overview.storage.disk_space?.message || "Agentless mode: host-level free disk is unavailable."}>
-              <span>Free Disk</span><strong>{formatBytes(overview.storage.disk_space.free_bytes)}</strong>
+              <span>Free Disk</span><strong>{formatDiskSpaceAgentless(overview.storage.disk_space)}</strong>
             </div>
             <div title="Replication replay delay on standby">
               <span>Replay Lag</span>
@@ -378,6 +394,12 @@ export function TargetDetailPage() {
             <div><span>Replication Slots</span><strong>{overview.replication.replication_slots_count ?? "-"}</strong></div>
             <div><span>Repl Clients</span><strong>{overview.replication.active_replication_clients ?? "-"}</strong></div>
             <div><span>Autovacuum Workers</span><strong>{overview.performance.autovacuum_workers ?? "-"}</strong></div>
+            <div title="Host CPU requires OS-level telemetry">
+              <span>Host CPU</span><strong>{formatHostMetricUnavailable()}</strong>
+            </div>
+            <div title="Host RAM requires OS-level telemetry">
+              <span>Host RAM</span><strong>{formatHostMetricUnavailable()}</strong>
+            </div>
           </div>
 
           <div className="grid two">