From 5d4320bc735c2461fda7865e6601f2158de044ec Mon Sep 17 00:00:00 2001
From: zvx <mj@k7zvx.com>
Date: Thu, 21 May 2026 07:05:20 +0000
Subject: [PATCH] =?UTF-8?q?feat(L-c):=20operator=20/events=20table=20polis?=
 =?UTF-8?q?h=20=E2=80=94=20readable=20Time,=20Location,=20Subject,=20Adapt?=
 =?UTF-8?q?er=20columns;=20sortable;=20plain-language=20summaries?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 src/central/gui/routes.py                     |  37 ++-
 .../templates/_event_summaries/_default.html  |   2 +
 .../gui/templates/_event_summaries/eonet.html |   2 +
 .../gui/templates/_event_summaries/firms.html |   2 +
 .../gui/templates/_event_summaries/gdacs.html |   2 +
 .../templates/_event_summaries/inciweb.html   |   2 +
 .../gui/templates/_event_summaries/nwis.html  |   2 +
 .../gui/templates/_event_summaries/nws.html   |   2 +
 .../_event_summaries/swpc_alerts.html         |   2 +
 .../_event_summaries/swpc_kindex.html         |   2 +
 .../_event_summaries/swpc_protons.html        |   2 +
 .../_event_summaries/usgs_quake.html          |   2 +
 .../_event_summaries/wfigs_incidents.html     |   2 +
 .../_event_summaries/wfigs_perimeters.html    |   2 +
 src/central/gui/templates/_events_rows.html   |  30 ++-
 src/central/gui/templates/events_list.html    |  62 +++++
 tests/test_events_feed_frontend.py            | 243 ++++++++++++++++++
 17 files changed, 381 insertions(+), 17 deletions(-)
 create mode 100644 src/central/gui/templates/_event_summaries/_default.html
 create mode 100644 src/central/gui/templates/_event_summaries/eonet.html
 create mode 100644 src/central/gui/templates/_event_summaries/firms.html
 create mode 100644 src/central/gui/templates/_event_summaries/gdacs.html
 create mode 100644 src/central/gui/templates/_event_summaries/inciweb.html
 create mode 100644 src/central/gui/templates/_event_summaries/nwis.html
 create mode 100644 src/central/gui/templates/_event_summaries/nws.html
 create mode 100644 src/central/gui/templates/_event_summaries/swpc_alerts.html
 create mode 100644 src/central/gui/templates/_event_summaries/swpc_kindex.html
 create mode 100644 src/central/gui/templates/_event_summaries/swpc_protons.html
 create mode 100644 src/central/gui/templates/_event_summaries/usgs_quake.html
 create mode 100644 src/central/gui/templates/_event_summaries/wfigs_incidents.html
 create mode 100644 src/central/gui/templates/_event_summaries/wfigs_perimeters.html

diff --git a/src/central/gui/routes.py b/src/central/gui/routes.py
index 7673e21..a056496 100644
--- a/src/central/gui/routes.py
+++ b/src/central/gui/routes.py
@@ -4,7 +4,7 @@ import base64
 import json
 import logging
 import re
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any
 
 logger = logging.getLogger("central.gui.routes")
@@ -2870,6 +2870,31 @@ def _geometry_summary(geometry: dict | None) -> str:
         return geom_type
 
 
+def _format_event_time(iso: str | None) -> str:
+    """Format an ISO-8601 timestamp as 'MM-DD-YYYY HH:MM UTC' (24h, no seconds)."""
+    if not iso:
+        return ""
+    try:
+        dt = datetime.fromisoformat(iso).astimezone(timezone.utc)
+    except (ValueError, TypeError):
+        return iso
+    return dt.strftime("%m-%d-%Y %H:%M") + " UTC"
+
+
+def _decorate_table_events(events: list[dict]) -> None:
+    """Add display-only fields used by the HTML events table (in place).
+
+    These are for the table chrome only and are deliberately NOT added in
+    _fetch_events, so the /events.json payload is unchanged. adapter_display
+    is sourced from the registry (display_name), with the bare name as fallback.
+    """
+    display = {cls.name: cls.display_name for cls in discover_adapters().values()}
+    for event in events:
+        event["geometry_summary"] = _geometry_summary(event.get("geometry"))
+        event["time_human"] = _format_event_time(event.get("time"))
+        event["adapter_display"] = display.get(event.get("adapter"), event.get("adapter"))
+
+
 
 @router.get("/events.json")
 async def events_json(request: Request):
@@ -2958,9 +2983,8 @@ async def events_list(request: Request) -> HTMLResponse:
             events = result.events
             next_cursor = result.next_cursor
 
-    # Add geometry summary to each event
-    for event in events:
-        event["geometry_summary"] = _geometry_summary(event.get("geometry"))
+    # Add table-only display fields (time_human, adapter_display, geometry_summary)
+    _decorate_table_events(events)
 
     # Registry-derived adapter list for the filter <select> and map legend.
     # Sorted by name for stable ordering; index drives the legend color palette.
@@ -3022,9 +3046,8 @@ async def events_rows(request: Request) -> HTMLResponse:
             events = result.events
             next_cursor = result.next_cursor
 
-    # Add geometry summary to each event
-    for event in events:
-        event["geometry_summary"] = _geometry_summary(event.get("geometry"))
+    # Add table-only display fields (time_human, adapter_display, geometry_summary)
+    _decorate_table_events(events)
 
     return templates.TemplateResponse(
         request=request,
diff --git a/src/central/gui/templates/_event_summaries/_default.html b/src/central/gui/templates/_event_summaries/_default.html
new file mode 100644
index 0000000..3a32583
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/_default.html
@@ -0,0 +1,2 @@
+{# No per-adapter summary; the Subject cell falls back to "—" and the map
+   popup omits the subject line. #}
diff --git a/src/central/gui/templates/_event_summaries/eonet.html b/src/central/gui/templates/_event_summaries/eonet.html
new file mode 100644
index 0000000..a11dff4
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/eonet.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('title') %}{{ d.title }}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/firms.html b/src/central/gui/templates/_event_summaries/firms.html
new file mode 100644
index 0000000..70c00c2
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/firms.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('frp') is not none or d.get('confidence') %}Fire detected{% if d.get('frp') is not none %} — {{ d.frp }} MW radiative power{% endif %}{% if d.get('confidence') == 'high' %} (high confidence){% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/gdacs.html b/src/central/gui/templates/_event_summaries/gdacs.html
new file mode 100644
index 0000000..6ecd4d8
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/gdacs.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('title') %}{{ d.title }}{% endif %}{% if d.get('alertlevel') %} — {{ d.alertlevel }} alert{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/inciweb.html b/src/central/gui/templates/_event_summaries/inciweb.html
new file mode 100644
index 0000000..a11dff4
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/inciweb.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('title') %}{{ d.title }}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/nwis.html b/src/central/gui/templates/_event_summaries/nwis.html
new file mode 100644
index 0000000..f628d04
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/nwis.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('value') is not none %}Water reading: {{ d.value }}{% if d.get('unit_of_measure') %} {{ d.unit_of_measure }}{% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/nws.html b/src/central/gui/templates/_event_summaries/nws.html
new file mode 100644
index 0000000..a868718
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/nws.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('event') %}{{ d.event }}{% endif %}{% if d.get('severity') %} — {{ d.severity }}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/swpc_alerts.html b/src/central/gui/templates/_event_summaries/swpc_alerts.html
new file mode 100644
index 0000000..e6fb2a9
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/swpc_alerts.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('product_id') or d.get('message') %}Space weather alert{% if d.get('product_id') %} {{ d.product_id }}{% endif %}{% if d.get('message') %}: {{ d.message | replace('\r', ' ') | replace('\n', ' ') | truncate(80) }}{% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/swpc_kindex.html b/src/central/gui/templates/_event_summaries/swpc_kindex.html
new file mode 100644
index 0000000..3cc91a2
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/swpc_kindex.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('Kp') is not none %}Geomagnetic activity (Kp index): {{ d.Kp }}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/swpc_protons.html b/src/central/gui/templates/_event_summaries/swpc_protons.html
new file mode 100644
index 0000000..a00e6d1
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/swpc_protons.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('flux') is not none %}Solar proton flux: {{ d.flux | round(2) }} pfu{% if d.get('energy') %} at {{ d.energy }}{% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/usgs_quake.html b/src/central/gui/templates/_event_summaries/usgs_quake.html
new file mode 100644
index 0000000..71b347d
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/usgs_quake.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('magnitude') is not none %}Magnitude {{ d.magnitude | round(1) }}{% if d.get('place') %} — {{ d.place }}{% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/wfigs_incidents.html b/src/central/gui/templates/_event_summaries/wfigs_incidents.html
new file mode 100644
index 0000000..cfd1451
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/wfigs_incidents.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('county') or d.get('state') %}Wildfire incident — {% if d.get('county') %}{{ d.county }}{% if d.get('state') %}, {% endif %}{% endif %}{% if d.get('state') %}{{ d.state }}{% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_event_summaries/wfigs_perimeters.html b/src/central/gui/templates/_event_summaries/wfigs_perimeters.html
new file mode 100644
index 0000000..d31b9c2
--- /dev/null
+++ b/src/central/gui/templates/_event_summaries/wfigs_perimeters.html
@@ -0,0 +1,2 @@
+{% set d = (event.data.get('data') or {}).get('data') or {} %}
+{%- if d.get('county') or d.get('state') %}Wildfire perimeter — {% if d.get('county') %}{{ d.county }}{% if d.get('state') %}, {% endif %}{% endif %}{% if d.get('state') %}{{ d.state }}{% endif %}{% endif -%}
diff --git a/src/central/gui/templates/_events_rows.html b/src/central/gui/templates/_events_rows.html
index ce78c60..a1eb264 100644
--- a/src/central/gui/templates/_events_rows.html
+++ b/src/central/gui/templates/_events_rows.html
@@ -10,30 +10,40 @@
         <tr>
             <th style="width: 2rem;"></th>
             <th>Time</th>
-            <th>Adapter</th>
-            <th>Category</th>
-            <th>Geometry</th>
+            <th>Location</th>
             <th>Subject</th>
+            <th>Adapter</th>
         </tr>
     </thead>
     <tbody>
         {% for event in events %}
+        {# Per-adapter one-line summary, dispatched by adapter name with a generic
+           fallback (no hardcoded list). Captured once so it serves both the
+           Subject cell and the map popup (via data-subject). #}
+        {% set subject_summary %}{% include ["_event_summaries/" ~ event.adapter ~ ".html", "_event_summaries/_default.html"] %}{% endset %}
+        {# Location: generic _enriched.geocoder reader, then top-level named
+           fields, then coordinates. No adapter-specific logic. #}
+        {% set d = (event.data.get('data') or {}).get('data') or {} %}
+        {% set gc = (d.get('_enriched') or {}).get('geocoder') or {} %}
+        {% set loc_local = gc.get('city') or d.get('city') or gc.get('county') or d.get('county') %}
+        {% set loc_state = gc.get('state') or d.get('state') %}
+        {% set loc_country = gc.get('country') or d.get('country') %}
+        {% set loc_parts = [loc_local, loc_state, loc_country] | select | list %}
         <tr class="event-row" data-row-idx="{{ loop.index0 }}"
             data-event-id="{{ event.id }}"
             data-adapter="{{ event.adapter }}"
             data-category="{{ event.category }}"
             data-time="{{ event.time }}"
-            data-subject="{{ event.subject or '' }}"
+            data-subject="{{ subject_summary | trim }}"
             {% if event.geometry %}data-geometry='{{ event.geometry | tojson }}'{% endif %}>
             <td><button type="button" class="expand-row" aria-label="Expand">&#9656;</button></td>
-            <td>{{ event.time }}</td>
-            <td>{{ event.adapter }}</td>
-            <td>{{ event.category }}</td>
-            <td>{{ event.geometry_summary }}</td>
-            <td>{{ event.subject or '—' }}</td>
+            <td title="{{ event.time }}">{{ event.time_human }}</td>
+            <td>{% if loc_parts %}{{ loc_parts | join(', ') }}{% elif gc.get('landclass') %}{{ gc.landclass }}{% else %}—{% endif %}</td>
+            <td>{{ subject_summary | trim or '—' }}</td>
+            <td>{{ event.adapter_display }}</td>
         </tr>
         <tr class="event-detail" hidden>
-            <td colspan="6">
+            <td colspan="5">
                 <dl class="event-detail-list">
                     <dt>Event ID</dt>
                     <dd><code>{{ event.id }}</code></dd>
diff --git a/src/central/gui/templates/events_list.html b/src/central/gui/templates/events_list.html
index da4225c..82734c8 100644
--- a/src/central/gui/templates/events_list.html
+++ b/src/central/gui/templates/events_list.html
@@ -465,8 +465,67 @@
     // Fit to results button
     document.getElementById("fit-to-results").addEventListener("click", fitToAllLayers);
 
+    // Client-side sort of the displayed rows; state persists across HTMX swaps.
+    var sortState = { col: null, dir: 1 };  // dir: 1 asc, -1 desc
+
+    function sortKey(row, col) {
+        // Time sorts on the ISO timestamp for true chronological order.
+        if (col === 1) return row.dataset.time || "";
+        var cell = row.children[col];
+        return cell ? cell.textContent.trim().toLowerCase() : "";
+    }
+
+    function applySort() {
+        if (sortState.col === null) return;
+        var tbody = document.querySelector("#events-rows table.events-table tbody");
+        if (!tbody) return;
+        var pairs = [];
+        tbody.querySelectorAll("tr.event-row").forEach(function(r) {
+            pairs.push([r, r.nextElementSibling]);  // main row + its detail row
+        });
+        // Array.prototype.sort is stable (ES2019+), so equal keys keep order.
+        pairs.sort(function(a, b) {
+            var ka = sortKey(a[0], sortState.col), kb = sortKey(b[0], sortState.col);
+            if (ka < kb) return -sortState.dir;
+            if (ka > kb) return sortState.dir;
+            return 0;
+        });
+        pairs.forEach(function(p) {
+            tbody.appendChild(p[0]);
+            if (p[1]) tbody.appendChild(p[1]);
+        });
+    }
+
+    function updateSortIndicators(ths) {
+        ths.forEach(function(th, idx) {
+            th.querySelectorAll(".sort-ind").forEach(function(s) { s.remove(); });
+            if (idx === sortState.col) {
+                var s = document.createElement("span");
+                s.className = "sort-ind";
+                s.textContent = sortState.dir === 1 ? " ▲" : " ▼";
+                th.appendChild(s);
+            }
+        });
+    }
+
+    function bindSortHandlers() {
+        var ths = document.querySelectorAll("#events-rows table.events-table thead th");
+        ths.forEach(function(th, idx) {
+            if (idx === 0) return;  // expand column is not sortable
+            th.style.cursor = "pointer";
+            th.onclick = function() {
+                if (sortState.col === idx) { sortState.dir *= -1; }
+                else { sortState.col = idx; sortState.dir = 1; }
+                updateSortIndicators(ths);
+                applySort();
+            };
+        });
+        updateSortIndicators(ths);
+    }
+
     // Initial load - bind layers and fit bounds
     rebindEventLayers(); // Initial load only
+    bindSortHandlers();
     if (false) { // DISABLED: map never auto-fits
         fitToAllLayers();
         isInitialLoad = false;
@@ -477,6 +536,9 @@
     document.body.addEventListener("htmx:afterSwap", function(evt) {
         if (evt.detail.target.id === "events-rows") {
             rebindEventLayers();
+            // Re-bind sort handlers to the new rows and re-apply the active sort.
+            bindSortHandlers();
+            applySort();
             // Do NOT call fitToAllLayers - preserve user viewport
         }
     });
diff --git a/tests/test_events_feed_frontend.py b/tests/test_events_feed_frontend.py
index ce13739..a2b557c 100644
--- a/tests/test_events_feed_frontend.py
+++ b/tests/test_events_feed_frontend.py
@@ -842,3 +842,246 @@ class TestMapAllAdapterGeometry:
         ).read_text()
         assert "// rebindEventLayers(); // DISABLED" not in src
         assert "isDegenerate" in src
+
+
+# --- PR L-c: readable Time / Location / Subject / Adapter columns ---------
+
+
+def _first_row_cells(html):
+    """Visible <td> text of the first event-row (before its detail row).
+
+    Splits on the detail row's class attribute (not the bare string
+    'event-detail', which also appears in the page's <style> block).
+    """
+    import re
+    body = html.split('class="event-detail"')[0]
+    return [
+        re.sub(r"<[^>]+>", "", c).strip()
+        for c in re.findall(r"<td[^>]*>(.*?)</td>", body, re.S)
+    ]
+
+
+class TestEventTimeFormat:
+    """(A) Server-side 'MM-DD-YYYY HH:MM UTC' formatting (24h, no seconds)."""
+
+    def test_format_basic_utc(self):
+        from central.gui.routes import _format_event_time
+        assert _format_event_time("2026-05-21T06:00:00+00:00") == "05-21-2026 06:00 UTC"
+
+    def test_format_converts_offset_to_utc(self):
+        from central.gui.routes import _format_event_time
+        # 19:30 at -06:00 is 01:30 UTC the next day.
+        assert _format_event_time("2026-05-20T19:30:00-06:00") == "05-21-2026 01:30 UTC"
+
+    def test_format_empty_and_none(self):
+        from central.gui.routes import _format_event_time
+        assert _format_event_time("") == ""
+        assert _format_event_time(None) == ""
+
+    def test_format_no_seconds_no_offset_suffix(self):
+        from central.gui.routes import _format_event_time
+        out = _format_event_time("2026-01-02T03:04:59+00:00")
+        assert out == "01-02-2026 03:04 UTC"
+        assert ":59" not in out and "+00" not in out
+
+
+class TestTableDisplayDecoration:
+    """(A)/(D) _decorate_table_events adds display fields; /events.json unaffected."""
+
+    def test_adapter_display_matches_registry(self):
+        from central.adapter_discovery import discover_adapters
+        from central.gui.routes import _decorate_table_events, _format_event_time
+        registry = discover_adapters()
+        events = [_event(name) for name in registry]
+        _decorate_table_events(events)
+        for ev in events:
+            cls = registry[ev["adapter"]]
+            assert ev["adapter_display"] == cls.display_name
+            assert ev["time_human"] == _format_event_time(ev["time"])
+
+    def test_unknown_adapter_display_falls_back_to_name(self):
+        from central.gui.routes import _decorate_table_events
+        events = [_event("not_a_real_adapter")]
+        _decorate_table_events(events)
+        assert events[0]["adapter_display"] == "not_a_real_adapter"
+
+    @pytest.mark.asyncio
+    async def test_events_json_has_no_table_only_fields(self):
+        # No /events.json schema change: display fields must not leak into JSON.
+        mock_request = MagicMock()
+        mock_request.state.operator = MagicMock(id=1, username="admin")
+        mock_request.query_params = {}
+
+        mock_conn = AsyncMock()
+        mock_conn.fetch.return_value = [{
+            "id": "e1",
+            "time": datetime(2026, 5, 21, 6, 0, tzinfo=timezone.utc),
+            "received": datetime(2026, 5, 21, 6, 0, tzinfo=timezone.utc),
+            "adapter": "nwis",
+            "category": "hydro",
+            "subject": None,
+            "geometry": None,
+            "data": {},
+            "regions": [],
+        }]
+        mock_pool = MagicMock()
+        mock_pool.acquire.return_value.__aenter__ = AsyncMock(return_value=mock_conn)
+        mock_pool.acquire.return_value.__aexit__ = AsyncMock(return_value=None)
+
+        with patch("central.gui.routes.get_pool", return_value=mock_pool):
+            resp = await events_json(mock_request)
+
+        ev = json.loads(resp.body)["events"][0]
+        assert "time_human" not in ev
+        assert "adapter_display" not in ev
+
+
+class TestLocationColumn:
+    """(B) Generic _enriched/top-level location reader — no adapter logic."""
+
+    def _location(self, inner):
+        return _first_row_cells(_render_rows([_event("usgs_quake", inner=inner)]))[2]
+
+    def test_city_state_country(self):
+        loc = self._location({"_enriched": {"geocoder": {
+            "city": "Trinidad", "state": "Colorado", "country": "United States"}}})
+        assert loc == "Trinidad, Colorado, United States"
+
+    def test_state_country_when_city_null(self):
+        loc = self._location({"_enriched": {"geocoder": {
+            "city": None, "state": "Missouri", "country": "United States"}}})
+        assert loc == "Missouri, United States"
+
+    def test_top_level_country_fallback(self):
+        # gdacs-style: no geocoder, country at top level.
+        assert self._location({"country": "Austria"}) == "Austria"
+
+    def test_top_level_state_only_fallback(self):
+        # wfigs-style: state code at top level, no country.
+        assert self._location({"state": "CO"}) == "CO"
+
+    def test_landclass_fallback(self):
+        loc = self._location({"_enriched": {"geocoder": {
+            "city": None, "state": None, "country": None,
+            "landclass": "Ridgecrest Field Office"}}})
+        assert loc == "Ridgecrest Field Office"
+
+    def test_coordinates_alone_are_not_a_location(self):
+        # Bare lat/lon is a position, not a place name -> "—".
+        assert self._location({"latitude": 35.3603324, "longitude": -117.7854995}) == "—"
+
+    def test_none_when_nothing_available(self):
+        assert self._location({}) == "—"
+
+
+class TestSubjectColumn:
+    """(C) Per-adapter one-line summaries, registry-derived dispatch + fallback."""
+
+    def test_every_adapter_has_a_summary_partial(self):
+        from central.adapter_discovery import discover_adapters
+        from central.gui import templates as gui_templates
+        for name in discover_adapters():
+            gui_templates.env.get_template("_event_summaries/%s.html" % name)
+
+    def test_default_summary_partial_exists(self):
+        from central.gui import templates as gui_templates
+        gui_templates.env.get_template("_event_summaries/_default.html")
+
+    def test_every_adapter_summary_renders_without_error(self):
+        from central.adapter_discovery import discover_adapters
+        for name in discover_adapters():
+            _render_rows([_event(name)])  # must not raise
+
+    def test_usgs_quake_summary_is_plain_language(self):
+        cells = _first_row_cells(_render_rows([_event(
+            "usgs_quake", inner={"magnitude": 1.347, "magType": "ml",
+                                 "place": "14 km W of Johannesburg, CA"})]))
+        assert cells[3] == "Magnitude 1.3 — 14 km W of Johannesburg, CA"
+        assert "ml" not in cells[3]  # scale code dropped
+
+    def test_nwis_summary_drops_parameter_code(self):
+        cells = _first_row_cells(_render_rows([_event(
+            "nwis", inner={"parameter_code": "00060", "value": 111.0,
+                           "unit_of_measure": "ft^3/s"})]))
+        assert cells[3] == "Water reading: 111.0 ft^3/s"
+        assert "00060" not in cells[3]  # opaque pcode dropped
+
+    def test_unknown_adapter_summary_is_dash(self):
+        cells = _first_row_cells(_render_rows([_event("not_a_real_adapter", inner={"x": 1})]))
+        assert cells[3] == "—"
+
+    def test_summary_populates_data_subject_for_popup(self):
+        html = _render_rows([_event("usgs_quake", inner={"magnitude": 1.347,
+                                                          "place": "near Town"})])
+        assert 'data-subject="Magnitude 1.3 — near Town"' in html
+
+
+class TestTableRendersThroughHTTP:
+    """End-to-end HTTP render: Time and Adapter cells must be populated in the
+    real response, guarding the route->template binding (not the helper alone)."""
+
+    def _mock_pool(self):
+        now = datetime(2026, 5, 21, 6, 0, tzinfo=timezone.utc)
+
+        def _fetchrow(query, *args):
+            q = " ".join(str(query).split())
+            if "config.sessions" in q:
+                return {"id": 1, "username": "admin", "created_at": now,
+                        "password_changed_at": now, "csrf_token": "csrf"}
+            if "map_tile_url" in q:
+                return {"map_tile_url": "https://t/{z}/{x}/{y}.png",
+                        "map_attribution": "OSM"}
+            return None
+
+        rows = [
+            {"id": "evt-q", "time": now, "received": now, "adapter": "usgs_quake",
+             "category": "quake", "subject": None, "geometry": None,
+             "data": {"data": {"data": {"magnitude": 1.3, "place": "near Town"}}},
+             "regions": []},
+            {"id": "evt-w", "time": now, "received": now, "adapter": "nwis",
+             "category": "hydro", "subject": None, "geometry": None,
+             "data": {"data": {"data": {"value": 5.0, "unit_of_measure": "ft"}}},
+             "regions": []},
+        ]
+        mock_conn = MagicMock()
+        mock_conn.fetchrow = AsyncMock(side_effect=_fetchrow)
+        mock_conn.fetch = AsyncMock(return_value=rows)
+        mock_conn.__aenter__ = AsyncMock(return_value=mock_conn)
+        mock_conn.__aexit__ = AsyncMock()
+        mock_pool = MagicMock()
+        mock_pool.acquire = MagicMock(return_value=mock_conn)
+        return mock_pool
+
+    def _client(self):
+        from fastapi import FastAPI
+        from starlette.testclient import TestClient
+        from central.gui.middleware import SessionMiddleware
+        from central.gui.routes import router
+        app = FastAPI()
+        app.include_router(router)
+        app.add_middleware(SessionMiddleware)
+        return TestClient(app, cookies={"central_session": "valid"})
+
+    def _expected_adapter_display(self):
+        from central.adapter_discovery import discover_adapters
+        return discover_adapters()["usgs_quake"].display_name
+
+    def test_events_page_time_and_adapter_cells_populated(self):
+        mock_pool = self._mock_pool()
+        with patch("central.gui.middleware.get_pool", return_value=mock_pool), \
+             patch("central.gui.routes.get_pool", return_value=mock_pool):
+            resp = self._client().get("/events")
+        assert resp.status_code == 200
+        cells = _first_row_cells(resp.text)
+        assert cells[1].endswith("UTC") and "2026" in cells[1]   # Time non-empty
+        assert cells[4] == self._expected_adapter_display()       # Adapter display_name
+
+    def test_events_rows_fragment_time_and_adapter_cells_populated(self):
+        mock_pool = self._mock_pool()
+        with patch("central.gui.middleware.get_pool", return_value=mock_pool), \
+             patch("central.gui.routes.get_pool", return_value=mock_pool):
+            resp = self._client().get("/events/rows")
+        assert resp.status_code == 200
+        cells = _first_row_cells(resp.text)
+        assert cells[1].endswith("UTC") and "2026" in cells[1]   # Time non-empty
+        assert cells[4] == self._expected_adapter_display()       # Adapter display_name