feat(schema): 005 — tags, entity_tags, entity_links, attachments

lib/db/migrations/005_cross.sql

@@ -0,0 +1,43 @@
+CREATE TABLE tags (
+  id          uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  name        text NOT NULL UNIQUE,
+  description text,
+  color       text,
+  created_at  timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE TABLE entity_tags (
+  entity_type text NOT NULL,
+  entity_id   uuid NOT NULL,
+  tag_id      uuid NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
+  created_at  timestamptz NOT NULL DEFAULT now(),
+  PRIMARY KEY (entity_type, entity_id, tag_id)
+);
+
+CREATE TABLE entity_links (
+  id        uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  from_type text NOT NULL,
+  from_id   uuid NOT NULL,
+  to_type   text NOT NULL,
+  to_id     uuid NOT NULL,
+  relation  text NOT NULL DEFAULT 'attached',
+  created_at timestamptz NOT NULL DEFAULT now(),
+  UNIQUE (from_type, from_id, to_type, to_id, relation)
+);
+
+CREATE TABLE attachments (
+  id          uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  entity_type text,
+  entity_id   uuid,
+  filename    text NOT NULL,
+  mime_type   text,
+  size_bytes  bigint,
+  blob_path   text NOT NULL,
+  checksum    text,
+  uploaded_at timestamptz NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_entity_tags_entity ON entity_tags(entity_type, entity_id);
+CREATE INDEX idx_entity_links_from ON entity_links(from_type, from_id);
+CREATE INDEX idx_entity_links_to ON entity_links(to_type, to_id);
+CREATE INDEX idx_attachments_entity ON attachments(entity_type, entity_id);