fix: render datetime values in render_value (fixes Fusion test_timings)

[haritamar]

Summary

Fusion test_timings has been failing in every recent run (assert results[0]["execute_started_at"] → None).

Root cause: CI installs the latest Fusion on each run. Since 2.0.0-preview.218 (last green was preview.205), run_result.timing[*].started_at/completed_at are exposed to Jinja as datetime objects rather than ISO strings. default__render_value had no datetime branch, so these fell through to the null fallback and all *_started_at/_completed_at columns in dbt_run_results were inserted as NULL. Timing extraction in flatten_run_result was correct — the loss happened at SQL-literal rendering.

Fix: add datetime support directly in render_value, via a new shared edr_is_datetime macro (also used by agate_val_serialize, which previously inlined the same duck-typed check):

{% macro edr_is_datetime(val) %}
    {% do return(val is not none and val is not string and val is not mapping and val.year is defined) %}
{% endmacro %}

{# default__render_value #}
{%- if elementary.edr_is_datetime(value) -%}
    {%- set value = value.isoformat() -%}
{%- endif -%}
{# ...existing string/timestamp branches handle the ISO string as before #}

Notes:

• Duck-typing on .year (not .isoformat) is required: under Fusion's Jinja, value.isoformat is defined is False for datetime objects even though value.isoformat() is callable.
• is not mapping guards against dicts with a year key resolving via attribute lookup.

Verified locally on Fusion 2.0.0-preview.218 (experimental postgres adapter) — dbt_run_results timestamps populated — and on dbt-core postgres (test_timings, test_insert_rows, test_artifacts pass).

Link to Devin session: https://app.devin.ai/sessions/6726671cbb9f449c8089476ee27d6f73
Open in Devin Desktop: https://app.devin.ai/desktop/session/6726671cbb9f449c8089476ee27d6f73?variant=devin
Requested by: @haritamar

Summary by CodeRabbit

• Bug Fixes
  • Improved datetime detection during value rendering and serialization for more consistent results.
  • Datetime values continue to be serialized in ISO format.
  • Mapping values are preserved rather than converted to ISO-formatted strings when they expose a year attribute.
  • Decimal values and other fallback serialization behavior remain unchanged.

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👋 @haritamar
Thank you for raising your pull request.
Please make sure to add tests and document all user-facing changes.
You can do this by editing the docs files in the elementary repository.

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📒 Files selected for processing (2)

• macros/utils/data_types/edr_is_datetime.sql
• macros/utils/run_queries/agate_to_dicts.sql

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📝 Walkthrough

Walkthrough

The run result macro now normalizes timing entries before adding them to the result. The new macro converts non-string started_at and completed_at values to ISO strings, preserves other fields, and returns non-mapping inputs unchanged.

Changes

Timing result normalization

Layer / File(s)	Summary
Normalize timing entries macros/utils/graph/get_run_result_dict.sql	The result-building path calls normalize_timing_dict. The macro converts non-string timing fields to ISO-formatted strings and preserves other values and non-mapping inputs.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to b0829

This change preserves run timing values by rendering datetime-like values as ISO-formatted strings instead of NULL. No merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: fixing datetime rendering in render_value to resolve Fusion test_timings failures.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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Inline comments:
In `@macros/utils/table_operations/insert_rows.sql`:
- Around line 352-354: Update default__render_value to exclude mappings from the
date-normalization condition before checking value.year, so mapping values such
as {"year": 2024} reach the tojson() serialization branch instead of calling
isoformat(). Add coverage for this case in
test_render_insert_rows_queries_values.

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