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COMPATIBILITY ANALYSIS REPORT
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Analysis Date: 2026-02-16T13:47:27.050459
Overall Compatibility: POTENTIALLY_INCOMPATIBLE

SUMMARY
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Breaking Changes: 0
Potentially Breaking: 4
Non-Breaking Changes: 0
Additive Changes: 0
Total Issues Found: 4

RISK ASSESSMENT
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Overall Risk: medium
Deployment Risk: safe_independent_deployment
Rollback Complexity: low
Testing Requirements: ['integration_testing', 'regression_testing', 'data_migration_testing']

POTENTIALLY BREAKING ISSUES
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• New check constraint 'phone IS NULL OR LENGTH(phone) >= 10' added to table 'users'
  Field: tables.users.constraints.check
  Impact: New check constraint may reject existing data
  Migration: Validate existing data complies with new constraint
  Affected Operations: INSERT, UPDATE

• New check constraint 'bio IS NULL OR LENGTH(bio) <= 2000' added to table 'user_profiles'
  Field: tables.user_profiles.constraints.check
  Impact: New check constraint may reject existing data
  Migration: Validate existing data complies with new constraint
  Affected Operations: INSERT, UPDATE

• New check constraint 'language IN ('en', 'es', 'fr', 'de', 'it', 'pt', 'ru', 'ja', 'ko', 'zh')' added to table 'user_profiles'
  Field: tables.user_profiles.constraints.check
  Impact: New check constraint may reject existing data
  Migration: Validate existing data complies with new constraint
  Affected Operations: INSERT, UPDATE

• New check constraint 'session_type IN ('web', 'mobile', 'api', 'admin')' added to table 'user_sessions'
  Field: tables.user_sessions.constraints.check
  Impact: New check constraint may reject existing data
  Migration: Validate existing data complies with new constraint
  Affected Operations: INSERT, UPDATE

SUGGESTED MIGRATION SCRIPTS
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1. Create new table user_preferences
   Type: sql
   Script:
     CREATE TABLE user_preferences (
       id bigint NOT NULL,
       user_id bigint NOT NULL,
       preference_key varchar NOT NULL,
       preference_value json,
       created_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
       updated_at timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
     );

2. Add column email_verified_at to table users
   Type: sql
   Script:
     ALTER TABLE users ADD COLUMN email_verified_at timestamp;

3. Add column phone_verified_at to table users
   Type: sql
   Script:
     ALTER TABLE users ADD COLUMN phone_verified_at timestamp;

4. Add column two_factor_enabled to table users
   Type: sql
   Script:
     ALTER TABLE users ADD COLUMN two_factor_enabled boolean NOT NULL DEFAULT False;

5. Add column last_login_at to table users
   Type: sql
   Script:
     ALTER TABLE users ADD COLUMN last_login_at timestamp;

6. Add check constraint to users
   Type: sql
   Script:
     ALTER TABLE users ADD CONSTRAINT check_users CHECK (phone IS NULL OR LENGTH(phone) >= 10);

7. Add column timezone to table user_profiles
   Type: sql
   Script:
     ALTER TABLE user_profiles ADD COLUMN timezone varchar DEFAULT UTC;

8. Add column language to table user_profiles
   Type: sql
   Script:
     ALTER TABLE user_profiles ADD COLUMN language varchar NOT NULL DEFAULT en;

9. Add check constraint to user_profiles
   Type: sql
   Script:
     ALTER TABLE user_profiles ADD CONSTRAINT check_user_profiles CHECK (bio IS NULL OR LENGTH(bio) <= 2000);

10. Add check constraint to user_profiles
   Type: sql
   Script:
     ALTER TABLE user_profiles ADD CONSTRAINT check_user_profiles CHECK (language IN ('en', 'es', 'fr', 'de', 'it', 'pt', 'ru', 'ja', 'ko', 'zh'));

11. Add column session_type to table user_sessions
   Type: sql
   Script:
     ALTER TABLE user_sessions ADD COLUMN session_type varchar NOT NULL DEFAULT web;

12. Add column is_mobile to table user_sessions
   Type: sql
   Script:
     ALTER TABLE user_sessions ADD COLUMN is_mobile boolean NOT NULL DEFAULT False;

13. Add check constraint to user_sessions
   Type: sql
   Script:
     ALTER TABLE user_sessions ADD CONSTRAINT check_user_sessions CHECK (session_type IN ('web', 'mobile', 'api', 'admin'));

RECOMMENDATIONS
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1. Conduct thorough testing with realistic data volumes
2. Implement monitoring for migration success metrics
3. Test all migration scripts in staging environment
4. Implement migration progress monitoring
5. Create detailed communication plan for stakeholders
6. Implement feature flags for gradual rollout