Bug 1990006 - Remove clustering by unique keys.

Partitioning by submission_date is sufficient for query optimization.

Author: jjjalkanen

sql_generators/gecko_trace/templates/derived/gecko_trace_events_v1/metadata.yaml

@@ -23,6 +23,3 @@ bigquery:
     type: day
     field: submission_date
     require_partition_filter: true
-  clustering:
-    fields:
-      - event_signature

sql_generators/gecko_trace/templates/derived/gecko_trace_traces_v1/metadata.yaml

@@ -1,17 +1,11 @@
 ---
 friendly_name: Gecko Trace Traces
 description: |-
-  Complete Gecko traces with hierarchical span structures and calculated signatures.
+  Aggregated gecko trace patterns with Merkle-chain signatures.
 
-  This table combines individual spans into complete traces, building the
-  hierarchical tree structure of spans within each trace. Each row represents
-  a single trace containing:
-  - Root span with nested child spans in a tree structure
-  - Total trace duration calculated from span timings
-  - Signature hash for grouping traces with similar execution patterns
-
-  The root_span field contains the complete hierarchical structure of all
-  spans within the trace, with child spans nested in childSpans arrays.
+  One row per unique execution pattern, identified by trace_signature (SHA256).
+  Accumulates hit_count across daily runs, tracking first/latest observation dates
+  and average duration.
 
 owners:
   - jjalkanen@mozilla.com
@@ -29,7 +23,3 @@ bigquery:
     type: day
     field: submission_date
     require_partition_filter: true
-  clustering:
-    fields:
-      - trace_id
-      - signature