feat: add octolensKeywordMappings table (CM-1833)

[themarolt]

Summary

Adds the table that maps an Octolens keyword to the CDP segment it should route mentions
into, so a single global Octolens poll can fan out across thousands of projects.

Changes

• New migration: octolensKeywordMappings (integrationId, segmentId, keywordId,
  keyword, timestamps; unique on (integrationId, keywordId))

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Performance improvement
• Chore / dependency update
• Documentation

JIRA ticket

https://linuxfoundation.atlassian.net/browse/CM-1833

[cursor]

PR Summary

Low Risk
Schema-only migration adding a new mapping table with standard FK constraints; no runtime or auth logic in this PR.

Overview
Adds a new integration.octolensKeywordMappings table so each Octolens keyword can be tied to a CDP segment for routing mentions from a shared poll.

Rows store integrationId, segmentId, keywordId, and keyword, with createdAt/updatedAt, FK to public.integrations (cascade on delete) and public.segments, and a unique constraint on (integrationId, keywordId).

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[Copilot]

Copilot review overview

🟡 Changes recommended

The integration foreign key prevents deleting integrations that have mappings unless cascading deletion is added.

Review effort: Balanced
Findings: 1

Open (1)

• Add cascade delete for Octolens integration mappings · New

What changed in this PR

Adds persistence for routing Octolens keyword mentions to CDP segments.

Changes:

• Adds keyword-to-segment mappings scoped by integration.
• Enforces unique integration/keyword pairs.

File	Description
V1790929179__octolens-keyword-mappings.sql	Creates the Octolens keyword mapping table.

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[Copilot]

Copilot review overview

🟡 Changes recommended

The migration must be renamed with a version greater than all existing migrations.

Review effort: Balanced
Findings: 1

Open (1)

• Migration version is lower than existing versions · New

Resolved since last review (1)

• Add cascade delete for Octolens integration mappings

[Copilot]

Copilot review overview

🟢 Approval recommended

The migration is correctly ordered, preserves referential integrity, and matches the stated schema requirements.

Review effort: Balanced
Findings: None

Resolved since last review (1)

• Migration version is lower than existing versions