commit 5538e4765074af62c2e656184e30341a1d8d4c71 · bretton.dev/coves

+66
internal/db/migrations/021_add_comment_deletion_metadata.sql
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       -- +goose Up

     

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       -- Add deletion reason tracking to preserve thread structure while respecting privacy

     

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       -- When comments are deleted, we blank content but keep the record for threading

     

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       -- Create enum type for deletion reasons

     

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       CREATE TYPE deletion_reason AS ENUM ('author', 'moderator');

     

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       -- Add new columns to comments table

     

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       ALTER TABLE comments ADD COLUMN deletion_reason deletion_reason;

     

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       ALTER TABLE comments ADD COLUMN deleted_by TEXT;

     

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       -- Add comments for new columns

     

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       COMMENT ON COLUMN comments.deletion_reason IS 'Reason for deletion: author (user deleted), moderator (community mod removed)';

     

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       COMMENT ON COLUMN comments.deleted_by IS 'DID of the actor who performed the deletion';

     

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       -- Backfill existing deleted comments as author-deleted

     

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       -- This handles existing soft-deleted comments gracefully

     

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       UPDATE comments

     

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       SET deletion_reason = 'author',

     

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           deleted_by = commenter_did

     

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       WHERE deleted_at IS NOT NULL AND deletion_reason IS NULL;

     

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       -- Modify existing indexes to NOT filter deleted_at IS NULL

     

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       -- This allows deleted comments to appear in thread queries for structure preservation

     

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       -- Note: We drop and recreate to change the partial index condition

     

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       -- Drop old partial indexes that exclude deleted comments

     

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       DROP INDEX IF EXISTS idx_comments_root;

     

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       DROP INDEX IF EXISTS idx_comments_parent;

     

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       DROP INDEX IF EXISTS idx_comments_parent_score;

     

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       DROP INDEX IF EXISTS idx_comments_uri_active;

     

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       -- Recreate indexes without the deleted_at filter (include all comments for threading)

     

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       CREATE INDEX idx_comments_root ON comments(root_uri, created_at DESC);

     

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       CREATE INDEX idx_comments_parent ON comments(parent_uri, created_at DESC);

     

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       CREATE INDEX idx_comments_parent_score ON comments(parent_uri, score DESC, created_at DESC);

     

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       CREATE INDEX idx_comments_uri_lookup ON comments(uri);

     

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       -- Add index for querying by deletion_reason (for moderation dashboard)

     

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       CREATE INDEX idx_comments_deleted_reason ON comments(deletion_reason, deleted_at DESC)

     

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       WHERE deleted_at IS NOT NULL;

     

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       -- Add index for querying by deleted_by (for moderation audit/filtering)

     

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       CREATE INDEX idx_comments_deleted_by ON comments(deleted_by, deleted_at DESC)

     

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       WHERE deleted_at IS NOT NULL;

     

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       -- +goose Down

     

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       -- Remove deletion metadata columns and restore original indexes

     

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       DROP INDEX IF EXISTS idx_comments_deleted_by;

     

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       DROP INDEX IF EXISTS idx_comments_deleted_reason;

     

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       DROP INDEX IF EXISTS idx_comments_uri_lookup;

     

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       DROP INDEX IF EXISTS idx_comments_parent_score;

     

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       DROP INDEX IF EXISTS idx_comments_parent;

     

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       DROP INDEX IF EXISTS idx_comments_root;

     

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       -- Restore original partial indexes (excluding deleted comments)

     

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       CREATE INDEX idx_comments_root ON comments(root_uri, created_at DESC) WHERE deleted_at IS NULL;

     

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       CREATE INDEX idx_comments_parent ON comments(parent_uri, created_at DESC) WHERE deleted_at IS NULL;

     

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       CREATE INDEX idx_comments_parent_score ON comments(parent_uri, score DESC, created_at DESC) WHERE deleted_at IS NULL;

     

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       CREATE INDEX idx_comments_uri_active ON comments(uri) WHERE deleted_at IS NULL;

     

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       ALTER TABLE comments DROP COLUMN IF EXISTS deleted_by;

     

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       ALTER TABLE comments DROP COLUMN IF EXISTS deletion_reason;

     

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       DROP TYPE IF EXISTS deletion_reason;