feat(clickhouse): infer mixed-type JSON arrays as Array(Dynamic) on insert

Set input_format_json_infer_array_of_dynamic_from_array_of_different_types=1
on all native-JSON inserts (task_runs_v2, task_events_v1/v2, metrics_v1,
sessions_v1). Mixed-type arrays (e.g. [{...}, "str"]) are now inferred as
Array(Dynamic) rather than deeply nested Tuple types, which avoids hitting
the binary type-complexity limit during background merges.

Making the setting explicit at insert time keeps the behavior deterministic
and version-controlled, independent of the server profile / compatibility
version.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AaChyhestFMBYBWh6bgcCF

Author: claude

.server-changes/clickhouse-array-of-dynamic-inference.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: fix
+---
+
+Infer mixed-type JSON arrays as Array(Dynamic) instead of nested tuples when writing run, event, metric, and session data to avoid ClickHouse type-complexity merge failures

internal-packages/clickhouse/src/metrics.ts

@@ -22,6 +22,7 @@ export function insertMetrics(ch: ClickhouseWriter) {
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       input_format_json_throw_on_bad_escape_sequence: 0,
       input_format_json_use_string_type_for_ambiguous_paths_in_named_tuples_inference_from_objects: 1,
     },

internal-packages/clickhouse/src/sessions.ts

@@ -118,6 +118,7 @@ export function insertSessionsCompactArrays(ch: ClickhouseWriter, settings?: Cli
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       ...settings,
     },
   });
@@ -131,6 +132,7 @@ export function insertSessions(ch: ClickhouseWriter, settings?: ClickHouseSettin
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       ...settings,
     },
   });

internal-packages/clickhouse/src/taskEvents.ts

@@ -31,6 +31,7 @@ export function insertTaskEvents(ch: ClickhouseWriter, settings?: ClickHouseSett
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       input_format_json_throw_on_bad_escape_sequence: 0,
       input_format_json_use_string_type_for_ambiguous_paths_in_named_tuples_inference_from_objects: 1,
       ...settings,
@@ -206,6 +207,7 @@ export function insertTaskEventsV2(ch: ClickhouseWriter, settings?: ClickHouseSe
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       input_format_json_throw_on_bad_escape_sequence: 0,
       input_format_json_use_string_type_for_ambiguous_paths_in_named_tuples_inference_from_objects: 1,
       ...settings,

internal-packages/clickhouse/src/taskRuns.ts

@@ -211,6 +211,7 @@ export function insertTaskRunsCompactArrays(ch: ClickhouseWriter, settings?: Cli
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       ...settings,
     },
   });
@@ -225,6 +226,7 @@ export function insertTaskRuns(ch: ClickhouseWriter, settings?: ClickHouseSettin
     settings: {
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       ...settings,
     },
   });
@@ -349,6 +351,7 @@ export function insertRawTaskRunPayloadsCompactArrays(
       async_insert_busy_timeout_ms: 1000,
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       ...settings,
     },
   });
@@ -367,6 +370,7 @@ export function insertRawTaskRunPayloads(ch: ClickhouseWriter, settings?: ClickH
       async_insert_busy_timeout_ms: 1000,
       enable_json_type: 1,
       type_json_skip_duplicated_paths: 1,
+      input_format_json_infer_array_of_dynamic_from_array_of_different_types: 1,
       ...settings,
     },
   });