diff --git a/package.json b/package.json
index 124a1ea..7df81c6 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,8 @@
     "build": "next build",
     "start": "next start",
     "db:generate": "drizzle-kit generate",
-    "db:push": "drizzle-kit migrate"
+    "db:push": "drizzle-kit migrate",
+    "db:studio": "drizzle-kit studio"
   },
   "dependencies": {
     "@better-auth/drizzle-adapter": "^1.5.4",
diff --git a/src/lib/model/experiment_calibration.ts b/src/lib/model/experiment_calibration.ts
new file mode 100644
index 0000000..c6cffd5
--- /dev/null
+++ b/src/lib/model/experiment_calibration.ts
@@ -0,0 +1,32 @@
+import { sqliteTable, text, integer, uniqueIndex } from 'drizzle-orm/sqlite-core';
+import { relations, sql } from 'drizzle-orm';
+import { experiment } from './experiment';
+
+export const experiment_calibration = sqliteTable(
+  'experiment_calibration',
+  {
+    id: integer('id').primaryKey({ autoIncrement: true }),
+    experimentId: integer('experiment_id')
+      .references(() => experiment.id),
+    dialectLabel: text('dialect_label').notNull(), // e.g. 'ch_be', 'ch_zh', …
+    order: integer('order').notNull(), // order of the calibration items
+    file: text('file').notNull(), // path to the audio file for calibration
+    createdAt: integer('created_at', { mode: 'timestamp' })
+      .notNull()
+      .default(sql`(unixepoch())`),
+    updatedAt: integer('updated_at', { mode: 'timestamp' })
+      .notNull()
+      .default(sql`(unixepoch())`)
+      .$onUpdate(() => sql`(unixepoch())`),
+  },
+);
+
+export const experiment_calibrationRelations = relations(experiment_calibration, ({ one }) => ({
+  experiment: one(experiment, {
+    fields: [experiment_calibration.experimentId],
+    references: [experiment.id],
+  })
+}));
+
+export type ExperimentCalibration = typeof experiment_calibration.$inferSelect;
+export type NewExperimentCalibration = typeof experiment_calibration.$inferInsert;
diff --git a/src/lib/model/participant.ts b/src/lib/model/participant.ts
new file mode 100644
index 0000000..e95eec8
--- /dev/null
+++ b/src/lib/model/participant.ts
@@ -0,0 +1,34 @@
+import { sqliteTable, text, integer, uniqueIndex } from 'drizzle-orm/sqlite-core';
+import { relations, sql } from 'drizzle-orm';
+import { dataset_entry } from './dataset_entry';
+import { experiment } from './experiment';
+
+export const participant = sqliteTable(
+  'participant',
+  {
+    id: integer('id').primaryKey({ autoIncrement: true }),
+    experimentId: integer('experiment_id').references(() => experiment.id),
+    userId: text('user_id').notNull(),
+    calibrationAnswers: text('calibration_answers', { mode: 'json' }), 
+    createdAt: integer('created_at', { mode: 'timestamp' })
+      .notNull()
+      .default(sql`(unixepoch())`),
+    updatedAt: integer('updated_at', { mode: 'timestamp' })
+      .notNull()
+      .default(sql`(unixepoch())`)
+      .$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;