Update schema.prisma

docs/migrationOpsContext.md

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+- Migration operations should include a review phase to assess the impact of schema changes on existing data before deployment.
+- Timing of migrations should consider the usage of the affected models to minimize disruption during peak usage times.

docs/migrationPatterns.md

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+- Before adding required fields, review the entire codebase to ensure compatibility with new schema changes, particularly for fields that impact critical functionality.
+- Implement a strategy to safely introduce new fields by either making them optional initially or providing sensible default values to avoid migration failures.
+- Always ensure that the migration process considers existing records and their compatibility with the new schema.

docs/schemaContext

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+- New fields should be added with consideration of existing application dependencies, ensuring they won’t disrupt current functionality.
+- If a new field is critical for functionality, constraints should be established to maintain data integrity and prevent null or invalid entries.

frontend/apps/migration-web/prisma/schema.prisma

@@ -186,4 +186,5 @@ model PRCommit {
   pullRequest   PullRequest   @relation(fields: [pullRequestId], references: [id])
   commitHash    String
   committedAt   DateTime
-}
+  sample        String
+}