feat: implement To/FromDbValue for chrono::DateTime<Utc>

[m4tx]

No description provided.

[Copilot]

Pull request overview

This PR implements To/FromDbValue traits for chrono::DateTime<Utc> and refactors chrono-related database field implementations by moving them to a dedicated module. The changes improve code organization while maintaining consistency with existing patterns.

Changes:

• Implements DatabaseField, FromDbValue, and ToDbValue for chrono::DateTime<Utc> and its Option variant
• Moves DateTime<FixedOffset> implementations from fields.rs to a new chrono_fields.rs module
• Refactors macro definitions to use fully qualified paths (e.g., crate::db::Result instead of Result)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
cot/src/db/fields/chrono_fields.rs	New module containing implementations for DateTime<FixedOffset> (moved) and DateTime<Utc> (new), following the same patterns for database field traits
cot/src/db/fields.rs	Refactored macros with fully qualified paths, added module declaration for chrono_fields, removed DateTime<FixedOffset> implementations (moved to new module), added use statements to export macros for use in submodules

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[github-actions]

Bencher Report

Branch	db-fields-chrono-utc
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result microseconds (µs) (Result Δ%)	Upper Boundary microseconds (µs) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	5,728.00 µs (-3.23%) Baseline: 5,918.90 µs	7,094.47 µs (80.74%)
json_api/json_api	📈 view plot 🚷 view threshold	1,047.70 µs (+3.15%) Baseline: 1,015.70 µs	1,162.70 µs (90.11%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	956.19 µs (+2.18%) Baseline: 935.79 µs	1,064.83 µs (89.80%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	911.97 µs (+1.69%) Baseline: 896.78 µs	1,022.90 µs (89.16%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	18,161.00 µs (+3.33%) Baseline: 17,575.45 µs	20,848.85 µs (87.11%)

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[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot/src/db/fields/chrono_fields.rs	66.10%	19 Missing and 1 partial ⚠️

Flag	Coverage Δ
rust	89.65% <76.19%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cot/src/db/fields.rs	86.09% <100.00%> (+4.46%)	⬆️
cot/src/db/fields/chrono_fields.rs	66.10% <66.10%> (ø)

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