feat: use juspay diesel

[yuvrajjsingh0]

Summary by CodeRabbit

• New Features

  • Added support for a local database-layer compatibility shim across the workspace.
  • Improved dependency handling so the app can use the updated database library consistently.

• Bug Fixes

  • Updated distinct-count logic in file and group listings for more reliable total item counts.
  • Aligned database-related features and version constraints to better match the runtime environment.

• Documentation

  • Added clearer explanatory comments around the database compatibility setup.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
airborne_server/src/file/groups.rs	20% smaller
Cargo.lock	Unsupported file format
Cargo.toml	Unsupported file format
airborne_server/Cargo.toml	Unsupported file format
airborne_server/src/file.rs	0% smaller
diesel-shim/Cargo.toml	Unsupported file format
diesel-shim/src/lib.rs	0% smaller
flake.nix	Unsupported file format

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Walkthrough

Adds a local diesel-shim crate re-exporting juspay_diesel as diesel, patches the workspace to redirect diesel to it, updates airborne_server's diesel dependency to target juspay_diesel 2.3.1 with rds-proxy, relaxes diesel_migrations version constraint, and updates distinct-count query syntax in two files.

Changes

Diesel Shim Migration

Layer / File(s)	Summary
New diesel-shim crate diesel-shim/Cargo.toml, diesel-shim/src/lib.rs	Defines a local diesel shim crate depending on juspay_diesel 2.3.1, forwarding feature flags, and re-exporting all juspay_diesel items publicly.
Workspace patch wiring Cargo.toml	Adds diesel-shim to workspace members and a [patch.crates-io] entry redirecting diesel to the local shim path.
Server dependency update airborne_server/Cargo.toml	Aliases diesel to juspay_diesel package at version 2.3.1 with rds-proxy feature added, and relaxes diesel_migrations to ~2.2.
Distinct-count query adjustments airborne_server/src/file.rs, airborne_server/src/file/groups.rs	Removes AggregateExpressionMethods imports and replaces count(...).aggregate_distinct() with diesel::dsl::count_distinct(...) for total item counts.

Estimated code review effort: 2 (Simple) | ~12 minutes

Sequence Diagram(s)

sequenceDiagram
    participant Build as Cargo Build
    participant Workspace as Workspace Cargo.toml
    participant Shim as diesel-shim crate
    participant Fork as juspay_diesel crate
    participant Server as airborne_server

    Build->>Workspace: Resolve diesel dependency
    Workspace->>Shim: patch.crates-io redirects diesel
    Shim->>Fork: pub use juspay_diesel::*
    Server->>Shim: use diesel::dsl::count_distinct(...)
    Shim->>Fork: forwards to juspay_diesel implementation
    Fork-->>Server: returns query results

Loading

Estimated code review effort: 2 (Simple) | ~12 minutes

Poem

A rabbit hops through crates so deep,
Redirecting diesel while others sleep. 🐇
juspay_diesel now takes the wheel,
count_distinct counts what's truly real.
Hop, patch, and build — a shim complete! 🥕

🚥 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 accurately summarizes the main change: switching the workspace to use juspay diesel.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/use-juspay-diesel

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