Initial commit

migrations/20260807000000_message_versions.sql

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+CREATE TABLE message_versions (
+    uuid UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    message_id BIGINT NOT NULL,
+    version BIGINT NOT NULL,
+    content TEXT,
+    archived_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+    UNIQUE (message_id, version),
+
+    FOREIGN KEY (message_id)
+        REFERENCES messages(message_id)
+        ON DELETE CASCADE
+);
+
+INSERT INTO message_versions (message_id, version, content)
+SELECT message_id, 1, content
+FROM messages;
+
+ALTER TABLE attachments
+    ADD COLUMN message_version BIGINT NOT NULL DEFAULT 1;
+
+ALTER TABLE attachments
+    DROP CONSTRAINT attachments_attachment_id_key;
+
+ALTER TABLE attachments
+    ADD UNIQUE (message_id, message_version, attachment_id),
+    ADD FOREIGN KEY (message_id, message_version)
+        REFERENCES message_versions(message_id, version)
+        ON DELETE CASCADE;
+
+ALTER TABLE embeds
+    ADD COLUMN message_version BIGINT NOT NULL DEFAULT 1;
+
+ALTER TABLE embeds
+    DROP CONSTRAINT embeds_message_id_embed_index_key;
+
+ALTER TABLE embeds
+    ADD UNIQUE (message_id, message_version, embed_index),
+    ADD FOREIGN KEY (message_id, message_version)
+        REFERENCES message_versions(message_id, version)
+        ON DELETE CASCADE;