fix(backend): implement cursor-based pagination and fix PostGIS locat…

[AryanYadav215]

Labels
ecosc'26, bug, backend

PR Description
Summary
This PR resolves Error #3 by introducing cursor-based pagination for the room history hydration endpoint and correcting a data structure bug that prevented proper PostGIS location insertions during room creation.

Type of Change

[x] 🐛 Bug fix (non-breaking change which fixes an issue)

[x] ✨ New feature (non-breaking change which adds functionality)

[ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)

[ ] 📝 Documentation update

Changes Made

Cursor-Based Pagination (GET /:id/history):

Replaced the static query with dynamic drizzle-orm operators (lt(), and()).

Endpoint now accepts an optional cursor query parameter (using the message ID).

Calculates and returns a nextCursor in the response payload to allow the frontend to seamlessly infinite-scroll historical messages.

Spatial Geometry Fix (POST /):

Corrected the Drizzle insert payload. The locationPoint generated via ST_SetSRID(ST_MakePoint()) is now properly assigned to the location column, replacing the malformed { x: lng, y: lat } object that caused database insert failures.

How Has This Been Tested?

[x] Local fastify instance testing.

[x] Verified spatial point insertion in the PostGIS database.

[x] Validated that the /:id/history endpoint successfully returns subsequent batches of older messages when passing the cursor parameter.

Checklist

[x] My code follows the style guidelines of this project.

[x] I have performed a self-review of my own code.

[x] I have commented my code, particularly in hard-to-understand areas.

[x] My changes generate no new warnings or type errors.

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