20 lines
792 B
MySQL
20 lines
792 B
MySQL
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-- Migration: Add comment threading support
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-- Adds parent_comment_id for reply/thread functionality
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-- Add parent_comment_id column for threaded comments
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ALTER TABLE ticket_comments
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ADD COLUMN parent_comment_id INT NULL DEFAULT NULL AFTER comment_id;
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-- Add foreign key constraint (self-referencing for thread hierarchy)
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ALTER TABLE ticket_comments
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ADD CONSTRAINT fk_parent_comment
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FOREIGN KEY (parent_comment_id) REFERENCES ticket_comments(comment_id)
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ON DELETE CASCADE;
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-- Add index for efficient thread retrieval
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CREATE INDEX idx_parent_comment ON ticket_comments(parent_comment_id);
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-- Add thread_depth column to track nesting level (prevents infinite recursion issues)
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ALTER TABLE ticket_comments
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ADD COLUMN thread_depth TINYINT UNSIGNED NOT NULL DEFAULT 0 AFTER parent_comment_id;
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