Fix metric bucket anchoring and add global whole-table metrics

Metrics reported row_count 0/1 against tables that plainly had 10+ rows.

1. The metric bucket was [run_date - 1d, run_date) - it ENDED at midnight at
   the start of the run day. A model stamping `dbt_updated_at =
   CURRENT_DATETIME()` writes rows during the run, so every row fell outside
   the bucket that run had just computed. Incremental merges that re-stamp
   rows each run then pushed them into the wrong bucket or out of every
   bucket. The bucket now covers the run's calendar day:
   [midnight of run date, +1d). interval_length_sec stays 86400 and the
   daily series is unchanged.

2. There was no way to see a table as a whole. `metrics_base_insert` now also
   emits `global__<metric>` computed over the whole table (`where true`)
   alongside the windowed series, so metrics stay meaningful for models whose
   time_filter holds historical/backfilled timestamps that miss the current
   bucket. A model with no time filter already computed globally and is not
   duplicated. Disable with `f2dq:emit_global_metrics: false`.

3. overview.json metric rows dropped `time_window_start`, so no consumer could
   tell a bucket's width or spot an empty one. It is exported now.

Also: keep the guard that skips save_test_history when the f2dq_test_history
relation does not exist.

The integration_tests project pins the original re_data bucket anchoring and
`f2dq:emit_global_metrics: false` because its expected_*.csv seeds encode the
values that bucket produces and cannot be regenerated without the upstream
multi-database harness.

Co-authored-by: Cursor <cursoragent@cursor.com>

macros/run_end/save_results_history.sql

@@ -9,20 +9,33 @@
     -- depends_on: {{ ref('f2dq_test_history') }}
     {% set command = flags.WHICH %}
     {% if execute and results and command in ('test', 'build') %}
-        {% set tests = [] %}
-        {% for el in results %}
-            {% if el.node.resource_type.value == 'test' %}
-                {% do tests.append(f2dq.test_data_dict(el)) %}
-            {% endif %}
-        {% endfor %}
-
-        {% if tests %}
-            {% do f2dq.insert_list_to_table(
-                ref('f2dq_test_history'),
-                tests,
-                ['table_name', 'column_name', 'test_name', 'status', 'execution_time', 'message', 'failures_count', 'failures_json', 'failures_table', 'severity', 'compiled_sql', 'run_at'],
-                { 'run_at': timestamp_type() }
+        {% set history_rel = ref('f2dq_test_history') %}
+        {% set history_exists = adapter.get_relation(
+            database=history_rel.database,
+            schema=history_rel.schema,
+            identifier=history_rel.identifier
+        ) is not none %}
+        {% if not history_exists %}
+            {% do log(
+                "f2dq_test_history relation missing (" ~ history_rel ~ "); skipping save_test_history",
+                info=True
             ) %}
+        {% else %}
+            {% set tests = [] %}
+            {% for el in results %}
+                {% if el.node.resource_type.value == 'test' %}
+                    {% do tests.append(f2dq.test_data_dict(el)) %}
+                {% endif %}
+            {% endfor %}
+
+            {% if tests %}
+                {% do f2dq.insert_list_to_table(
+                    history_rel,
+                    tests,
+                    ['table_name', 'column_name', 'test_name', 'status', 'execution_time', 'message', 'failures_count', 'failures_json', 'failures_table', 'severity', 'compiled_sql', 'run_at'],
+                    { 'run_at': timestamp_type() }
+                ) %}
+            {% endif %}
         {% endif %}
 
     {% endif %}