src/flask/static/js/charts.js

@@ -184,8 +184,16 @@
                 // Only finished brews have a measured ABV.  An unfinished run
                 // has a projection, not a measurement, so it is not plotted
                 // here.
+                //
+                // A suspect run is left out too.  Its ABV comes from an
+                // impossible reading (run 12 reads 18.64%), and plotting it
+                // stretched the y axis so that every real bar was squashed
+                // into the bottom of the plot - while the "Strongest" tile
+                // on the same page correctly showed 8.53%.  The chart and
+                // the tile contradicted each other.
                 var completed = runs.filter(function (r) {
-                    return r.abv !== null && r.abv !== undefined;
+                    return !r.suspect &&
+                        r.abv !== null && r.abv !== undefined;
                 });
                 if (!completed.length) { return; }
 
@@ -305,8 +313,14 @@
                 // A run with an impossible reading has no attenuation, and
                 // is flagged as suspect.  Both are excluded, so one bad
                 // reading cannot become a bar in the chart.
+                //
+                // Active runs are excluded as well.  Their attenuation is
+                // measured against their CURRENT gravity, so a brew that
+                // has just started shows a 0% bar - which is not a result,
+                // it is the absence of one.  The chart is about finished
+                // brews, and it sits above the table of finished brews.
                 var done = runs.filter(function (r) {
-                    return !r.suspect &&
+                    return !r.suspect && !r.active &&
                         r.attenuation !== null && r.attenuation !== undefined;
                 });
                 if (!done.length) { return; }

src/flask/templates/analysis.html

@@ -186,7 +186,7 @@
     </div>
     <div class="card__body">
         <p>
-            Across {% if stats.suspect_count %}{{ stats.trusted_count }} of {{ stats.count }}{% else %}{{ stats.count }}{% endif %} finished brews the attenuation averages
+            Across {% if stats.suspect_count %}{{ stats.counted_attenuation }} of {{ stats.count }}{% else %}{{ stats.count }}{% endif %} finished brews the attenuation averages
             <strong>{{ stats.consistency.mean }}%</strong>, with a standard
             deviation of <strong>{{ stats.consistency.stdev }} percentage
             points</strong> and a total range of {{ stats.consistency.spread }}

src/flask/templates/history.html

@@ -23,7 +23,13 @@
     <div class="stat">
         <div class="stat__label">Average ABV</div>
         <div class="stat__value">{{ '%.2f' % stats.avg_abv }}%</div>
-        <div class="stat__meta">across finished brews</div>
+        <div class="stat__meta">
+            {% if stats.abv_counted < stats.abv_total %}
+                across {{ stats.abv_counted }} of {{ stats.abv_total }} finished brews
+            {% else %}
+                across finished brews
+            {% endif %}
+        </div>
     </div>
     <div class="stat">
         <div class="stat__label">Strongest</div>

src/flask/views/analysis.py

@@ -55,6 +55,15 @@ def deep():
     suspect = implausible_runs(finished)
     suspect_ids = {s["beer_run_id"] for s in suspect}
 
+    # A run that is still fermenting can also have an impossible reading,
+    # and the API flags those too - so the charts leave them out.  If they
+    # were not listed here they would disappear from the analysis page
+    # entirely, with no explanation anywhere.
+    active_suspect = implausible_runs([r for r in runs if r.is_active()])
+    if active_suspect:
+        suspect = suspect + active_suspect
+        suspect_ids |= {s["beer_run_id"] for s in active_suspect}
+
     rows = []
     for run in finished:
         meta = metadata.get(run.beer_run_id, {})
@@ -111,6 +120,10 @@ def deep():
             "suspect_count": len(suspect),
             # How many runs the figures are actually based on.
             "trusted_count": len(good),
+            # How many of those actually contributed a figure to the
+            # average - a run with no original gravity has no attenuation,
+            # so it is counted above but not in the mean.
+            "counted_attenuation": len(attenuations),
             "avg_attenuation": round(sum(attenuations) / len(attenuations), 1)
             if attenuations else None,
             "avg_days": _fmt_days(sum(durations) / len(durations)) if durations else None,
@@ -278,5 +291,9 @@ def history():
             "avg_abv": avg_abv,
             "best": best,
             "worst": worst,
+            # How many of the finished brews the ABV figures are based
+            # on, so the tile can say so.
+            "abv_counted": len(good_abv_rows),
+            "abv_total": len(completed),
         },
     )

src/flask/views/brews.py

@@ -198,6 +198,10 @@ def api_runs():
     # The runs whose readings are physically impossible.  They are flagged
     # rather than dropped: the charts use the flag to leave them out of the
     # averages and the curve envelope, but a caller can still see them.
+    #
+    # The flag is computed over EVERY run, not just the finished ones, so
+    # it agrees with what the charts do.  An active run with a bad reading
+    # is still a run with a bad reading.
     suspect_ids = {s["beer_run_id"] for s in implausible_runs(runs)}
 
     payload = []
@@ -228,6 +232,7 @@ def api_run(run_id: str):
     # The same flag the list endpoint carries, so a consumer of the detail
     # endpoint can tell an impossible run from a good one.
     summary["suspect"] = bool(implausible_runs([run]))
+    summary["active"] = run.is_active()
     return jsonify(summary)
 
 

tests/test_analysis.py

@@ -508,3 +508,121 @@ def test_the_charts_fetch_the_run_payload_once():
         "the run payload should be fetched once and shared"
     )
     assert "function fetchRuns()" in charts_js
+
+# ------------------------------------------------- the chart exclusions #
+
+def test_the_abv_chart_leaves_out_the_suspect_runs():
+    """A suspect run's ABV comes from an impossible reading.
+
+    Run 12 reads 18.64%, and plotting it stretched the y axis so every
+    real bar was squashed into the bottom of the plot - while the
+    "Strongest" tile on the same page correctly showed 8.53%.  The chart
+    and the tile contradicted each other.
+    """
+    charts_js = (
+        Path(__file__).resolve().parents[1]
+        / "src" / "flask" / "static" / "js" / "charts.js"
+    ).read_text()
+
+    abv_chart = charts_js.split("function drawAbvChart")[1]
+    abv_chart = abv_chart.split("function drawMonthsChart")[0]
+    assert "!r.suspect" in abv_chart, (
+        "the ABV chart must leave the suspect runs out"
+    )
+
+
+def test_the_attenuation_chart_leaves_out_the_active_runs():
+    """An active run's attenuation is measured against its CURRENT gravity.
+
+    A brew that has just started shows a 0% bar - which is the absence of
+    a result, not a result.  The chart sits above the table of finished
+    brews.
+    """
+    charts_js = (
+        Path(__file__).resolve().parents[1]
+        / "src" / "flask" / "static" / "js" / "charts.js"
+    ).read_text()
+
+    att_chart = charts_js.split("function drawAttenuationChart")[1]
+    att_chart = att_chart.split("function drawCurveChart")[0]
+    assert "!r.active" in att_chart, (
+        "the attenuation chart must leave the active runs out"
+    )
+
+
+def test_a_suspect_active_run_is_still_listed_for_review(logged_in, repo):
+    """A bad reading in an active run must not make the run vanish.
+
+    The API flags suspect runs over EVERY run, so the charts leave them
+    out.  If the analysis page only looked at the finished ones, an
+    active run with a bad reading would disappear with no explanation
+    anywhere.
+    """
+    seed_readings(repo, [
+        ("1", "Finished ale", "1050", "2026-01-01", False, ""),
+        ("1", "Finished ale", "1010", "2026-01-10", True, ""),
+        # An ACTIVE run whose latest reading is below water.
+        ("20", "Active brew", "1042", "2026-02-01", False, ""),
+        ("20", "Active brew", "0900", "2026-02-10", False, "typo"),
+    ])
+
+    response = logged_in.get("/analysis")
+    body = response.get_data(as_text=True)
+
+    assert "Readings that need a second look" in body
+    assert "0.900" in body
+
+
+def test_the_history_page_says_how_many_brews_the_abv_figure_is_from(logged_in, repo):
+    """The tile must not quietly average fewer brews than it claims."""
+    seed_readings(repo, [
+        ("1", "Good ale", "1050", "2026-01-01", False, ""),
+        ("1", "Good ale", "1010", "2026-01-10", True, ""),
+        ("12", "Bad brew", "1042", "2026-01-01", False, ""),
+        ("12", "Bad brew", "0900", "2026-02-26", True, "typo"),
+    ])
+
+    response = logged_in.get("/history")
+    body = response.get_data(as_text=True)
+
+    assert "across 1 of 2 finished brews" in body
+
+
+def test_the_analysis_prose_counts_the_brews_that_contributed(logged_in, repo):
+    """The prose must not claim more brews than actually contributed.
+
+    The prose is rendered from the attenuation figures, so it counts the
+    brews that produced one - not the brews that were merely counted.
+    """
+    seed_readings(repo, [
+        ("1", "Good ale", "1050", "2026-01-01", False, ""),
+        ("1", "Good ale", "1010", "2026-01-10", True, ""),
+        ("2", "Good pale", "1042", "2026-02-01", False, ""),
+        ("2", "Good pale", "1012", "2026-02-10", True, ""),
+        ("12", "Bad brew", "1042", "2026-01-01", False, ""),
+        ("12", "Bad brew", "0900", "2026-02-26", True, "typo"),
+    ])
+
+    response = logged_in.get("/analysis")
+    body = " ".join(response.get_data(as_text=True).split())
+
+    # Three finished brews, two of which contributed an attenuation.
+    assert "Across 2 of 3 finished brews" in body
+
+
+def test_the_run_detail_api_carries_the_same_flags(logged_in, repo):
+    """A consumer of the detail endpoint can tell an impossible run from a
+    good one, and an active run from a finished one."""
+    seed_readings(repo, [
+        ("1", "Good ale", "1050", "2026-01-01", False, ""),
+        ("1", "Good ale", "1010", "2026-01-10", True, ""),
+        ("20", "Active brew", "1042", "2026-02-01", False, ""),
+    ])
+
+    finished = logged_in.get("/api/runs/1").get_json()
+    assert finished["suspect"] is False
+    assert finished["active"] is False
+
+    active = logged_in.get("/api/runs/20").get_json()
+    assert active["suspect"] is False
+    assert active["active"] is True