feat: add BigInt column type support and update related classes

[ArnabChatterjee20k]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds BigInt column type support across the migration library — introducing a new BigInt column class, a TYPE_BIG_INT constant, and wiring the type through the Appwrite source/destination and the NHost and CSV sources. The logic of the changes is sound and the NHost fix (mapping bigint/int8/numeric to BigInt instead of a 32-bit-bounded Integer) is a meaningful correctness improvement.

However, the PR has one blocking concern:

• Unreleased dev-branch dependency: composer.json pins utopia-php/database to dev-big-init as 5.4 — a development branch that has not been tagged or released. This makes the package unstable for downstream consumers and bypasses the declared minimum-stability: stable. The PR should not be merged until the upstream library ships a proper tagged release (e.g. 5.4.0) containing BigInt support.

Additional non-blocking finding:

• BigInt::fromArray() does not restore the signed field from the serialized array, meaning unsigned BigInt columns will incorrectly default to signed: true on deserialization. The same gap exists in Integer::fromArray() (pre-existing), but since BigInt is a new class this is a good opportunity to fix it.

Confidence Score: 4/5

Not safe to merge until utopia-php/database is released as a stable tagged version and the dev-branch alias is removed from composer.json.

The P1 issue in composer.json (dev-branch dependency) blocks merge because it introduces production instability for all downstream consumers of this library. All other application-level changes are correct and consistent with existing patterns.

composer.json (and correspondingly composer.lock) require attention — the dev-branch alias must be replaced with a stable release constraint once utopia-php/database is tagged.

Important Files Changed

Filename	Overview
composer.json	Pins utopia-php/database to the unreleased dev-big-init branch instead of a stable tag; this is a production risk and should not be merged until the upstream is released.
composer.lock	Lock file updated to point utopia-php/database at commit ef5c77972a95129eb929cce6c8f7c674db930ec9 on the big-init branch, with stability flag set to dev (20); reflects the unstable dependency in composer.json.
src/Migration/Resources/Database/Columns/BigInt.php	New BigInt column class modelled on Integer; correctly sets size=8 and delegates to parent, but fromArray() drops the signed field during deserialization.
src/Migration/Resources/Database/Column.php	Adds TYPE_BIG_INT = 'bigint' constant; straightforward and correct.
src/Migration/Destinations/Appwrite.php	Maps Column::TYPE_BIG_INT to UtopiaDatabase::VAR_BIGINT in the type switch; correct and consistent with surrounding mappings.
src/Migration/Sources/Appwrite.php	Adds a TYPE_BIG_INT case that constructs a BigInt column from API response data, mirroring the existing Integer case.
src/Migration/Sources/NHost.php	Correctly changes bigint, int8, and numeric PostgreSQL types to return a BigInt column instead of an Integer with 32-bit bounds.
src/Migration/Sources/CSV.php	Adds Column::TYPE_BIG_INT alongside TYPE_INTEGER in three parsing branches; cast logic is identical and correct for 64-bit PHP environments.

_{Reviews (1): Last reviewed commit: "feat: add BigInt column type support and..." | Re-trigger Greptile}

[greptile-apps]

Dev branch dependency should not be merged to main

The dependency is pinned to dev-big-init as 5.4, a development branch of utopia-php/database that has not been released as a stable version. This creates several production risks:

• The big-init branch can be force-pushed, rebased, or deleted at any time, breaking composer install for anyone pulling this library.
• The "minimum-stability": "stable" declared in composer.json is effectively bypassed via the stability-flags override in composer.lock (flag value 20 = dev-level stability).
• Downstream consumers of this library will also pull the unstable dev branch.

This PR should be blocked until utopia-php/database has an official tagged release (e.g. 5.4.0) that includes BigInt support, at which point the constraint should be updated to "utopia-php/database": "5.4.*" or "5.*".