feat(db): lab_drafts, lab_draws, biomarkers tables

Refs PAI-91.

server/src/db/schema.ts

@@ -1,4 +1,4 @@
-import { integer, sqliteTable, text } from "drizzle-orm/sqlite-core";
+import { integer, real, sqliteTable, text } from "drizzle-orm/sqlite-core";
 
 export const settings = sqliteTable("settings", {
   key: text("key").primaryKey(),
@@ -10,3 +10,37 @@ export const sessions = sqliteTable("sessions", {
   createdAt: integer("created_at").notNull(),
   expiresAt: integer("expires_at").notNull(),
 });
+
+export const labDrafts = sqliteTable("lab_drafts", {
+  id: text("id").primaryKey(),
+  filename: text("filename").notNull(),
+  filePath: text("file_path").notNull(),
+  status: text("status").notNull(), // pending | confirmed | discarded
+  extracted: text("extracted"),
+  error: text("error"),
+  createdAt: integer("created_at").notNull(),
+});
+
+export const labDraws = sqliteTable("lab_draws", {
+  id: text("id").primaryKey(),
+  collectedAt: text("collected_at").notNull(), // ISO date YYYY-MM-DD
+  labName: text("lab_name"),
+  draftId: text("draft_id"),
+  createdAt: integer("created_at").notNull(),
+});
+
+export const biomarkers = sqliteTable("biomarkers", {
+  id: integer("id").primaryKey({ autoIncrement: true }),
+  drawId: text("draw_id").notNull(),
+  panel: text("panel").notNull(),
+  name: text("name").notNull(),
+  marker: text("marker").notNull(),
+  analyteKey: text("analyte_key"),
+  value: text("value").notNull(),
+  valueNum: real("value_num"),
+  unit: text("unit"),
+  referenceRange: text("reference_range"),
+  flagged: integer("flagged").notNull().default(0),
+  valueCanonical: real("value_canonical"),
+  canonicalUnit: text("canonical_unit"),
+});