added calibration model

src/lib/model/participant.ts

@@ -0,0 +1,34 @@
+import { sqliteTable, text, integer, uniqueIndex } from 'drizzle-orm/sqlite-core';
+import { relations, sql } from 'drizzle-orm';
+import { dataset_entry } from './dataset_entry';
+import { experiment } from './experiment';
+
+export const participant = sqliteTable(
+  'participant',
+  {
+    id: integer('id').primaryKey({ autoIncrement: true }),
+    experimentId: integer('experiment_id').references(() => experiment.id),
+    userId: text('user_id').notNull(),
+    calibrationAnswers: text('calibration_answers', { mode: 'json' }), 
+    createdAt: integer('created_at', { mode: 'timestamp' })
+      .notNull()
+      .default(sql`(unixepoch())`),
+    updatedAt: integer('updated_at', { mode: 'timestamp' })
+      .notNull()
+      .default(sql`(unixepoch())`)
+      .$onUpdate(() => sql`(unixepoch())`),
+  },
+  (table) => ({
+    uniqueParticipant: uniqueIndex('unique_participant').on(table.experimentId, table.userId),
+  })
+);
+
+export const participantRelations = relations(participant, ({ one }) => ({
+  experiment: one(experiment, {
+    fields: [participant.experimentId],
+    references: [experiment.id],
+  })
+}));
+
+export type Participant = typeof participant.$inferSelect;
+export type NewParticipant = typeof participant.$inferInsert;