Feat: Login localization, design, märchenzauber feature complete webapp

packages/manadeck-database/src/schema/studySessions.ts

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+import {
+  pgTable,
+  uuid,
+  varchar,
+  integer,
+  timestamp,
+  index,
+  pgEnum,
+} from 'drizzle-orm/pg-core';
+import { relations } from 'drizzle-orm';
+import { decks } from './decks';
+
+// Study mode enum
+export const studyModeEnum = pgEnum('study_mode', ['all', 'new', 'review', 'favorites', 'random']);
+
+export const studySessions = pgTable(
+  'study_sessions',
+  {
+    id: uuid('id').primaryKey().defaultRandom(),
+    deckId: uuid('deck_id')
+      .notNull()
+      .references(() => decks.id, { onDelete: 'cascade' }),
+    userId: uuid('user_id').notNull(),
+    mode: studyModeEnum('mode').notNull(),
+    totalCards: integer('total_cards').notNull().default(0),
+    completedCards: integer('completed_cards').notNull().default(0),
+    correctCards: integer('correct_cards').notNull().default(0),
+    startedAt: timestamp('started_at', { withTimezone: true }).defaultNow().notNull(),
+    completedAt: timestamp('completed_at', { withTimezone: true }),
+    timeSpentSeconds: integer('time_spent_seconds').default(0).notNull(),
+  },
+  (table) => [
+    index('idx_study_sessions_user_id').on(table.userId),
+    index('idx_study_sessions_deck_id').on(table.deckId),
+    index('idx_study_sessions_started_at').on(table.startedAt),
+  ]
+);
+
+export const studySessionsRelations = relations(studySessions, ({ one }) => ({
+  deck: one(decks, {
+    fields: [studySessions.deckId],
+    references: [decks.id],
+  }),
+}));
+
+export type StudySession = typeof studySessions.$inferSelect;
+export type NewStudySession = typeof studySessions.$inferInsert;