fix(pipeline): query shortcuts + schema preview + serving meta fallback

- Add Shift+Enter shortcut to execute query (alongside Cmd/Ctrl+Enter)
- Add ▶ preview button to schema sidebar tables: populates editor with
  SELECT * FROM serving.<table> LIMIT 100 and auto-submits
- Update hint text to show "Shift+Enter to run"
- Overview tab: fall back to information_schema when _serving_meta.json
  is absent instead of showing error message; row counts show "—"
- Dashboard stat cards: same fallback — query DuckDB for table count

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/padelnomics/admin/pipeline_routes.py

@@ -372,11 +372,22 @@ def _is_stale(run: dict) -> bool:
 @role_required("admin")
 async def pipeline_dashboard():
     """Main page: health stat cards + tab container."""
-    summary = await asyncio.to_thread(_fetch_extraction_summary_sync)
+    from .analytics import fetch_analytics  # noqa: PLC0415
-    serving_meta = await asyncio.to_thread(_load_serving_meta)
 
-    total_serving_tables = len(serving_meta["tables"]) if serving_meta else 0
+    summary, serving_meta = await asyncio.gather(
-    last_export = serving_meta.get("exported_at_utc", "")[:19].replace("T", " ") if serving_meta else "—"
+        asyncio.to_thread(_fetch_extraction_summary_sync),
+        asyncio.to_thread(_load_serving_meta),
+    )
+
+    if serving_meta:
+        total_serving_tables = len(serving_meta.get("tables", {}))
+        last_export = serving_meta.get("exported_at_utc", "")[:19].replace("T", " ") or "—"
+    else:
+        schema_rows = await fetch_analytics(
+            "SELECT COUNT(*) AS n FROM information_schema.tables WHERE table_schema = 'serving'"
+        )
+        total_serving_tables = schema_rows[0]["n"] if schema_rows else 0
+        last_export = "—"
 
     success_rate = 0
     if summary["total"] > 0:
@@ -422,12 +433,30 @@ async def pipeline_overview():
     # Compute landing zone totals
     total_landing_bytes = sum(s["total_bytes"] for s in landing_stats)
 
+    # Build serving tables list: prefer _serving_meta.json (has counts + timestamp),
+    # fall back to information_schema when file doesn't exist yet.
+    if serving_meta:
+        serving_tables = [
+            {"name": name, "row_count": meta.get("row_count")}
+            for name, meta in sorted(serving_meta.get("tables", {}).items())
+        ]
+        last_export = serving_meta.get("exported_at_utc", "")[:19].replace("T", " ") or None
+    else:
+        from .analytics import fetch_analytics  # noqa: PLC0415
+        schema_rows = await fetch_analytics(
+            "SELECT table_name FROM information_schema.tables "
+            "WHERE table_schema = 'serving' ORDER BY table_name"
+        )
+        serving_tables = [{"name": r["table_name"], "row_count": None} for r in schema_rows]
+        last_export = None
+
     return await render_template(
         "admin/partials/pipeline_overview.html",
         workflow_rows=workflow_rows,
         landing_stats=landing_stats,
         total_landing_bytes=total_landing_bytes,
-        serving_meta=serving_meta,
+        serving_tables=serving_tables,
+        last_export=last_export,
         format_bytes=_format_bytes,
     )
 

web/src/padelnomics/admin/templates/admin/partials/pipeline_overview.html

@@ -56,10 +56,12 @@
   <!-- Serving Freshness -->
   <div class="card">
     <p class="card-header">Serving Tables</p>
-    {% if serving_meta %}
+    {% if last_export %}
     <p class="text-xs text-slate mb-3">
-      Last export: <span class="mono font-semibold text-navy">{{ serving_meta.exported_at_utc[:19].replace('T', ' ') }}</span>
+      Last export: <span class="mono font-semibold text-navy">{{ last_export }}</span>
     </p>
+    {% endif %}
+    {% if serving_tables %}
     <table class="table" style="font-size:0.8125rem">
       <thead>
         <tr>
@@ -68,18 +70,18 @@
         </tr>
       </thead>
       <tbody>
-        {% for tname, tmeta in serving_meta.tables.items() | sort %}
+        {% for t in serving_tables %}
         <tr>
-          <td class="mono">serving.{{ tname }}</td>
+          <td class="mono">serving.{{ t.name }}</td>
-          <td class="mono text-right font-semibold">{{ "{:,}".format(tmeta.row_count) }}</td>
+          <td class="mono text-right font-semibold">
+            {% if t.row_count is not none %}{{ "{:,}".format(t.row_count) }}{% else %}—{% endif %}
+          </td>
         </tr>
         {% endfor %}
       </tbody>
     </table>
     {% else %}
-    <p class="text-sm text-slate">
+    <p class="text-sm text-slate">No serving tables found — run the pipeline first.</p>
-      <code>_serving_meta.json</code> not found — run the pipeline to generate it.
-    </p>
     {% endif %}
   </div>
 

web/src/padelnomics/admin/templates/admin/partials/pipeline_query.html

@@ -189,7 +189,7 @@
           <path d="M21 12a9 9 0 1 1-6.219-8.56"/>
         </svg>
         <span class="query-limit-note">
-          {{ max_rows | default(1000) }} row limit · {{ timeout_seconds | default(10) }}s timeout · SELECT only
+          {{ max_rows | default(1000) }} row limit · {{ timeout_seconds | default(10) }}s timeout · SELECT only · Shift+Enter to run
         </span>
       </div>
     </div>
@@ -202,12 +202,18 @@
         <div class="schema-table-section">
           <button type="button" class="schema-table-toggle" onclick="toggleSchema('{{ tname }}')">
             {{ tname }}
-            <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"
+            <span style="display:flex;align-items:center;gap:4px;flex-shrink:0">
-                 stroke-width="2" stroke="currentColor"
+              <span title="Preview table" onclick="event.stopPropagation();previewTable('serving.{{ tname }}')"
-                 id="schema-chevron-{{ tname }}"
+                    style="padding:1px 5px;font-size:0.6rem;font-weight:600;background:#DBEAFE;color:#1D4ED8;border-radius:4px;font-family:sans-serif;letter-spacing:0">
-                 style="width:10px;height:10px;transition:transform 0.15s;flex-shrink:0">
+                ▶
-              <path stroke-linecap="round" stroke-linejoin="round" d="m8.25 4.5 7.5 7.5-7.5 7.5"/>
+              </span>
-            </svg>
+              <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"
+                   stroke-width="2" stroke="currentColor"
+                   id="schema-chevron-{{ tname }}"
+                   style="width:10px;height:10px;transition:transform 0.15s">
+                <path stroke-linecap="round" stroke-linejoin="round" d="m8.25 4.5 7.5 7.5-7.5 7.5"/>
+              </svg>
+            </span>
           </button>
           <div id="schema-cols-{{ tname }}" class="schema-cols">
             {% for col in cols %}
@@ -241,13 +247,18 @@ document.getElementById('query-sql').addEventListener('keydown', function(e) {
     this.value = this.value.substring(0, start) + '  ' + this.value.substring(end);
     this.selectionStart = this.selectionEnd = start + 2;
   }
-  // Cmd/Ctrl+Enter submits
+  // Shift+Enter or Cmd/Ctrl+Enter submits
-  if ((e.metaKey || e.ctrlKey) && e.key === 'Enter') {
+  if ((e.shiftKey || e.metaKey || e.ctrlKey) && e.key === 'Enter') {
     e.preventDefault();
     htmx.trigger(document.getElementById('query-form'), 'submit');
   }
 });
 
+function previewTable(fullName) {
+  document.getElementById('query-sql').value = 'SELECT *\nFROM ' + fullName + '\nLIMIT 100';
+  htmx.trigger(document.getElementById('query-form'), 'submit');
+}
+
 function toggleSchema(name) {
   var cols = document.getElementById('schema-cols-' + name);
   var chevron = document.getElementById('schema-chevron-' + name);