feat: add set_username and set_password to DatabaseUser

[m4tx]

Related issue or discussion

Description

This adds new methods to DatabaseUser that allow to set username and password for a user.

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

[github-actions]

Bencher Report

Branch	database_user_methods
Testbed	github-ubuntu-latest

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Benchmark	Latency	Benchmark Result microseconds (µs) (Result Δ%)	Upper Boundary microseconds (µs) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	6,578.20 µs (+7.80%) Baseline: 6,102.49 µs	7,699.78 µs (85.43%)
json_api/json_api	📈 view plot 🚷 view threshold	1,052.30 µs (-2.06%) Baseline: 1,074.49 µs	1,323.73 µs (79.49%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	967.44 µs (-2.58%) Baseline: 993.03 µs	1,204.49 µs (80.32%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	933.09 µs (-2.35%) Baseline: 955.50 µs	1,167.97 µs (79.89%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	17,624.00 µs (-0.44%) Baseline: 17,701.50 µs	21,171.80 µs (83.24%)

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[Copilot]

Pull request overview

This PR adds public mutator methods on DatabaseUser to update a user’s username and password (with automatic hashing), enabling in-memory updates prior to persisting via the ORM.

Changes:

• Added DatabaseUser::set_username to update the username field.
• Added DatabaseUser::set_password to update the password field by hashing a provided Password.
• Added rustdoc examples for both new methods.

Comments suppressed due to low confidence (1)

cot/src/auth/db.rs:149

• The doc test example for set_password also uses DatabaseUser::new(...), which is private, so this snippet will fail to compile under cargo test --doc. Adjust the example to use only public APIs (similar to other examples in this module) or make new public if exposing it is intended.

    /// ```
    /// use cot::auth::db::DatabaseUser;
    /// use cot::common_types::Password;
    /// # use cot::db::{Auto, LimitedString};
    ///
    /// # let mut user = DatabaseUser::new(Auto::fixed(1), LimitedString::new("user").unwrap(), &Password::new("oldpassword"));
    /// user.set_password(&Password::new("newpassword"));
    /// ```

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot/src/auth/db.rs	50.00%	6 Missing and 2 partials ⚠️

Flag	Coverage Δ
rust	90.29% <50.00%> (-0.04%)	⬇️

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Files with missing lines	Coverage Δ
cot/src/auth/db.rs	82.57% <50.00%> (-2.52%)	⬇️

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