add revision number

migrations/000042_add_revision_number_to_letter_outgoing.down.sql

@@ -0,0 +1,8 @@
+BEGIN;
+
+DROP INDEX IF EXISTS idx_letters_outgoing_revision_number;
+
+ALTER TABLE letters_outgoing
+DROP COLUMN IF EXISTS revision_number;
+
+COMMIT;

migrations/000042_add_revision_number_to_letter_outgoing.up.sql

@@ -0,0 +1,8 @@
+BEGIN;
+
+ALTER TABLE letters_outgoing 
+ADD COLUMN IF NOT EXISTS revision_number INTEGER NOT NULL DEFAULT 0;
+
+CREATE INDEX IF NOT EXISTS idx_letters_outgoing_revision_number ON letters_outgoing(revision_number);
+
+COMMIT;

migrations/000043_add_revision_number_to_attachments_and_approvals.down.sql

@@ -0,0 +1,14 @@
+BEGIN;
+
+-- Drop indexes
+DROP INDEX IF EXISTS idx_letter_outgoing_attachments_revision;
+DROP INDEX IF EXISTS idx_letter_outgoing_approvals_revision;
+
+-- Remove revision_number from tables
+ALTER TABLE letter_outgoing_attachments
+DROP COLUMN IF EXISTS revision_number;
+
+ALTER TABLE letter_outgoing_approvals
+DROP COLUMN IF EXISTS revision_number;
+
+COMMIT;

migrations/000043_add_revision_number_to_attachments_and_approvals.up.sql

@@ -0,0 +1,15 @@
+BEGIN;
+
+-- Add revision_number to letter_outgoing_attachments
+ALTER TABLE letter_outgoing_attachments 
+ADD COLUMN IF NOT EXISTS revision_number INTEGER NOT NULL DEFAULT 0;
+
+-- Add revision_number to letter_outgoing_approvals
+ALTER TABLE letter_outgoing_approvals 
+ADD COLUMN IF NOT EXISTS revision_number INTEGER NOT NULL DEFAULT 0;
+
+-- Create indexes for better query performance
+CREATE INDEX IF NOT EXISTS idx_letter_outgoing_attachments_revision ON letter_outgoing_attachments(letter_id, revision_number);
+CREATE INDEX IF NOT EXISTS idx_letter_outgoing_approvals_revision ON letter_outgoing_approvals(letter_id, revision_number);
+
+COMMIT;