diff --git a/packages/backend/drizzle/0002_youthful_storm.sql b/packages/backend/drizzle/0002_youthful_storm.sql
new file mode 100644
index 0000000..562782a
--- /dev/null
+++ b/packages/backend/drizzle/0002_youthful_storm.sql
@@ -0,0 +1,22 @@
+CREATE TABLE `lesson_subscriptions` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`user_id` integer NOT NULL,
+	`lesson_id` integer NOT NULL,
+	`created_at` integer DEFAULT (unixepoch()) NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`lesson_id`) REFERENCES `lessons`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+ALTER TABLE `card_progress` ADD `user_id` integer REFERENCES users(id);--> statement-breakpoint
+ALTER TABLE `lessons` ADD `owner_id` integer REFERENCES users(id);--> statement-breakpoint
+ALTER TABLE `lessons` ADD `visibility` text DEFAULT 'private' NOT NULL;--> statement-breakpoint
+ALTER TABLE `lessons` ADD `is_curated` integer DEFAULT false NOT NULL;--> statement-breakpoint
+ALTER TABLE `lessons` ADD `source_lesson_id` integer REFERENCES lessons(id);--> statement-breakpoint
+ALTER TABLE `sessions` ADD `user_id` integer REFERENCES users(id);--> statement-breakpoint
+CREATE INDEX `lesson_subscriptions_user_idx` ON `lesson_subscriptions` (`user_id`);--> statement-breakpoint
+CREATE INDEX `lesson_subscriptions_lesson_idx` ON `lesson_subscriptions` (`lesson_id`);--> statement-breakpoint
+CREATE UNIQUE INDEX `lesson_subscriptions_user_lesson_unique` ON `lesson_subscriptions` (`user_id`,`lesson_id`);--> statement-breakpoint
+CREATE INDEX `card_progress_user_idx` ON `card_progress` (`user_id`,`next_due_at`);--> statement-breakpoint
+CREATE INDEX `lessons_owner_idx` ON `lessons` (`owner_id`);--> statement-breakpoint
+CREATE INDEX `lessons_visibility_idx` ON `lessons` (`visibility`,`is_curated`);--> statement-breakpoint
+CREATE INDEX `sessions_user_idx` ON `sessions` (`user_id`,`status`);
\ No newline at end of file
diff --git a/packages/backend/drizzle/meta/0002_snapshot.json b/packages/backend/drizzle/meta/0002_snapshot.json
new file mode 100644
index 0000000..a6e2834
--- /dev/null
+++ b/packages/backend/drizzle/meta/0002_snapshot.json
@@ -0,0 +1,975 @@
+{
+  "version": "6",
+  "dialect": "sqlite",
+  "id": "763fe305-72a6-40e2-bc36-ed330b403044",
+  "prevId": "87d22455-00f9-454b-baac-bc7638274645",
+  "tables": {
+    "attempts": {
+      "name": "attempts",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "session_id": {
+          "name": "session_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "card_id": {
+          "name": "card_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "direction": {
+          "name": "direction",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "shown_at": {
+          "name": "shown_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "result": {
+          "name": "result",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "time_to_answer_ms": {
+          "name": "time_to_answer_ms",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "attempts_session_idx": {
+          "name": "attempts_session_idx",
+          "columns": [
+            "session_id"
+          ],
+          "isUnique": false
+        },
+        "attempts_card_idx": {
+          "name": "attempts_card_idx",
+          "columns": [
+            "card_id"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "attempts_session_id_sessions_id_fk": {
+          "name": "attempts_session_id_sessions_id_fk",
+          "tableFrom": "attempts",
+          "tableTo": "sessions",
+          "columnsFrom": [
+            "session_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "attempts_card_id_cards_id_fk": {
+          "name": "attempts_card_id_cards_id_fk",
+          "tableFrom": "attempts",
+          "tableTo": "cards",
+          "columnsFrom": [
+            "card_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "auth_tokens": {
+      "name": "auth_tokens",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "token_hash": {
+          "name": "token_hash",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "purpose": {
+          "name": "purpose",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "payload": {
+          "name": "payload",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "used_at": {
+          "name": "used_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        }
+      },
+      "indexes": {
+        "auth_tokens_hash_idx": {
+          "name": "auth_tokens_hash_idx",
+          "columns": [
+            "token_hash"
+          ],
+          "isUnique": false
+        },
+        "auth_tokens_user_purpose_idx": {
+          "name": "auth_tokens_user_purpose_idx",
+          "columns": [
+            "user_id",
+            "purpose"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "auth_tokens_user_id_users_id_fk": {
+          "name": "auth_tokens_user_id_users_id_fk",
+          "tableFrom": "auth_tokens",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "card_progress": {
+      "name": "card_progress",
+      "columns": {
+        "card_id": {
+          "name": "card_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "direction": {
+          "name": "direction",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "box": {
+          "name": "box",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 1
+        },
+        "correct_count": {
+          "name": "correct_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "incorrect_count": {
+          "name": "incorrect_count",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "last_shown_at": {
+          "name": "last_shown_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "next_due_at": {
+          "name": "next_due_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "card_progress_pk": {
+          "name": "card_progress_pk",
+          "columns": [
+            "card_id",
+            "direction"
+          ],
+          "isUnique": false
+        },
+        "card_progress_due_idx": {
+          "name": "card_progress_due_idx",
+          "columns": [
+            "next_due_at"
+          ],
+          "isUnique": false
+        },
+        "card_progress_user_idx": {
+          "name": "card_progress_user_idx",
+          "columns": [
+            "user_id",
+            "next_due_at"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "card_progress_card_id_cards_id_fk": {
+          "name": "card_progress_card_id_cards_id_fk",
+          "tableFrom": "card_progress",
+          "tableTo": "cards",
+          "columnsFrom": [
+            "card_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "card_progress_user_id_users_id_fk": {
+          "name": "card_progress_user_id_users_id_fk",
+          "tableFrom": "card_progress",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "cards": {
+      "name": "cards",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "lesson_id": {
+          "name": "lesson_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "question": {
+          "name": "question",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "answer": {
+          "name": "answer",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "hint": {
+          "name": "hint",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "position": {
+          "name": "position",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        }
+      },
+      "indexes": {
+        "cards_lesson_idx": {
+          "name": "cards_lesson_idx",
+          "columns": [
+            "lesson_id"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "cards_lesson_id_lessons_id_fk": {
+          "name": "cards_lesson_id_lessons_id_fk",
+          "tableFrom": "cards",
+          "tableTo": "lessons",
+          "columnsFrom": [
+            "lesson_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "lesson_subscriptions": {
+      "name": "lesson_subscriptions",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "lesson_id": {
+          "name": "lesson_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        }
+      },
+      "indexes": {
+        "lesson_subscriptions_user_idx": {
+          "name": "lesson_subscriptions_user_idx",
+          "columns": [
+            "user_id"
+          ],
+          "isUnique": false
+        },
+        "lesson_subscriptions_lesson_idx": {
+          "name": "lesson_subscriptions_lesson_idx",
+          "columns": [
+            "lesson_id"
+          ],
+          "isUnique": false
+        },
+        "lesson_subscriptions_user_lesson_unique": {
+          "name": "lesson_subscriptions_user_lesson_unique",
+          "columns": [
+            "user_id",
+            "lesson_id"
+          ],
+          "isUnique": true
+        }
+      },
+      "foreignKeys": {
+        "lesson_subscriptions_user_id_users_id_fk": {
+          "name": "lesson_subscriptions_user_id_users_id_fk",
+          "tableFrom": "lesson_subscriptions",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "lesson_subscriptions_lesson_id_lessons_id_fk": {
+          "name": "lesson_subscriptions_lesson_id_lessons_id_fk",
+          "tableFrom": "lesson_subscriptions",
+          "tableTo": "lessons",
+          "columnsFrom": [
+            "lesson_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "lessons": {
+      "name": "lessons",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "parent_id": {
+          "name": "parent_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "name": {
+          "name": "name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "description": {
+          "name": "description",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "position": {
+          "name": "position",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "bidirectional": {
+          "name": "bidirectional",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "owner_id": {
+          "name": "owner_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "visibility": {
+          "name": "visibility",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'private'"
+        },
+        "is_curated": {
+          "name": "is_curated",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": false
+        },
+        "source_lesson_id": {
+          "name": "source_lesson_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        }
+      },
+      "indexes": {
+        "lessons_owner_idx": {
+          "name": "lessons_owner_idx",
+          "columns": [
+            "owner_id"
+          ],
+          "isUnique": false
+        },
+        "lessons_visibility_idx": {
+          "name": "lessons_visibility_idx",
+          "columns": [
+            "visibility",
+            "is_curated"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "lessons_owner_id_users_id_fk": {
+          "name": "lessons_owner_id_users_id_fk",
+          "tableFrom": "lessons",
+          "tableTo": "users",
+          "columnsFrom": [
+            "owner_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "lessons_source_lesson_id_lessons_id_fk": {
+          "name": "lessons_source_lesson_id_lessons_id_fk",
+          "tableFrom": "lessons",
+          "tableTo": "lessons",
+          "columnsFrom": [
+            "source_lesson_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "sessions": {
+      "name": "sessions",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "lesson_id": {
+          "name": "lesson_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "started_at": {
+          "name": "started_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "ended_at": {
+          "name": "ended_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "duration_seconds": {
+          "name": "duration_seconds",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "cards_shown": {
+          "name": "cards_shown",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "cards_correct": {
+          "name": "cards_correct",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "cards_incorrect": {
+          "name": "cards_incorrect",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": 0
+        },
+        "status": {
+          "name": "status",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'active'"
+        },
+        "queue_snapshot": {
+          "name": "queue_snapshot",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "sessions_status_idx": {
+          "name": "sessions_status_idx",
+          "columns": [
+            "status"
+          ],
+          "isUnique": false
+        },
+        "sessions_user_idx": {
+          "name": "sessions_user_idx",
+          "columns": [
+            "user_id",
+            "status"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "sessions_lesson_id_lessons_id_fk": {
+          "name": "sessions_lesson_id_lessons_id_fk",
+          "tableFrom": "sessions",
+          "tableTo": "lessons",
+          "columnsFrom": [
+            "lesson_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "sessions_user_id_users_id_fk": {
+          "name": "sessions_user_id_users_id_fk",
+          "tableFrom": "sessions",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "sessions_auth": {
+      "name": "sessions_auth",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "text",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "last_used_at": {
+          "name": "last_used_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "ip": {
+          "name": "ip",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        }
+      },
+      "indexes": {
+        "sessions_auth_user_idx": {
+          "name": "sessions_auth_user_idx",
+          "columns": [
+            "user_id"
+          ],
+          "isUnique": false
+        },
+        "sessions_auth_expires_idx": {
+          "name": "sessions_auth_expires_idx",
+          "columns": [
+            "expires_at"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {
+        "sessions_auth_user_id_users_id_fk": {
+          "name": "sessions_auth_user_id_users_id_fk",
+          "tableFrom": "sessions_auth",
+          "tableTo": "users",
+          "columnsFrom": [
+            "user_id"
+          ],
+          "columnsTo": [
+            "id"
+          ],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    },
+    "users": {
+      "name": "users",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "integer",
+          "primaryKey": true,
+          "notNull": true,
+          "autoincrement": true
+        },
+        "email": {
+          "name": "email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "display_name": {
+          "name": "display_name",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false
+        },
+        "password_hash": {
+          "name": "password_hash",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "role": {
+          "name": "role",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "'user'"
+        },
+        "is_active": {
+          "name": "is_active",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": true
+        },
+        "email_verified_at": {
+          "name": "email_verified_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "pending_email": {
+          "name": "pending_email",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": false,
+          "autoincrement": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "(unixepoch())"
+        }
+      },
+      "indexes": {
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "columns": [
+            "email"
+          ],
+          "isUnique": true
+        },
+        "users_email_idx": {
+          "name": "users_email_idx",
+          "columns": [
+            "email"
+          ],
+          "isUnique": false
+        }
+      },
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {}
+    }
+  },
+  "enums": {},
+  "_meta": {
+    "schemas": {},
+    "tables": {},
+    "columns": {}
+  },
+  "internal": {
+    "indexes": {}
+  }
+}
\ No newline at end of file
diff --git a/packages/backend/drizzle/meta/_journal.json b/packages/backend/drizzle/meta/_journal.json
index 76e9881..6ef14e4 100644
--- a/packages/backend/drizzle/meta/_journal.json
+++ b/packages/backend/drizzle/meta/_journal.json
@@ -15,6 +15,13 @@
       "when": 1779309705807,
       "tag": "0001_fuzzy_silhouette",
       "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "6",
+      "when": 1779314536550,
+      "tag": "0002_youthful_storm",
+      "breakpoints": true
     }
   ]
 }
\ No newline at end of file
diff --git a/packages/backend/src/db/schema.ts b/packages/backend/src/db/schema.ts
index 173e5a5..0215794 100644
--- a/packages/backend/src/db/schema.ts
+++ b/packages/backend/src/db/schema.ts
@@ -1,16 +1,28 @@
 import { sql } from 'drizzle-orm';
-import { integer, sqliteTable, text, index } from 'drizzle-orm/sqlite-core';
+import type { AnySQLiteColumn } from 'drizzle-orm/sqlite-core';
+import { integer, sqliteTable, text, index, uniqueIndex } from 'drizzle-orm/sqlite-core';
 
-export const lessons = sqliteTable('lessons', {
-  id: integer('id').primaryKey({ autoIncrement: true }),
-  parentId: integer('parent_id'),
-  name: text('name').notNull(),
-  description: text('description'),
-  position: integer('position').notNull().default(0),
-  bidirectional: integer('bidirectional', { mode: 'boolean' }).notNull().default(false),
-  createdAt: integer('created_at').notNull().default(sql`(unixepoch())`),
-  updatedAt: integer('updated_at').notNull().default(sql`(unixepoch())`),
-});
+export const lessons = sqliteTable(
+  'lessons',
+  {
+    id: integer('id').primaryKey({ autoIncrement: true }),
+    parentId: integer('parent_id'),
+    name: text('name').notNull(),
+    description: text('description'),
+    position: integer('position').notNull().default(0),
+    bidirectional: integer('bidirectional', { mode: 'boolean' }).notNull().default(false),
+    ownerId: integer('owner_id').references(() => users.id, { onDelete: 'cascade' }),
+    visibility: text('visibility', { enum: ['private', 'shared'] }).notNull().default('private'),
+    isCurated: integer('is_curated', { mode: 'boolean' }).notNull().default(false),
+    sourceLessonId: integer('source_lesson_id').references((): AnySQLiteColumn => lessons.id, { onDelete: 'set null' }),
+    createdAt: integer('created_at').notNull().default(sql`(unixepoch())`),
+    updatedAt: integer('updated_at').notNull().default(sql`(unixepoch())`),
+  },
+  (t) => ({
+    ownerIdx: index('lessons_owner_idx').on(t.ownerId),
+    visibilityIdx: index('lessons_visibility_idx').on(t.visibility, t.isCurated),
+  })
+);
 
 export const cards = sqliteTable(
   'cards',
@@ -37,10 +49,12 @@ export const cardProgress = sqliteTable(
     incorrectCount: integer('incorrect_count').notNull().default(0),
     lastShownAt: integer('last_shown_at'),
     nextDueAt: integer('next_due_at').notNull().default(0),
+    userId: integer('user_id').references(() => users.id, { onDelete: 'cascade' }),
   },
   (t) => ({
     pk: index('card_progress_pk').on(t.cardId, t.direction),
     dueIdx: index('card_progress_due_idx').on(t.nextDueAt),
+    userIdx: index('card_progress_user_idx').on(t.userId, t.nextDueAt),
   })
 );
 
@@ -57,8 +71,12 @@ export const sessions = sqliteTable(
     cardsIncorrect: integer('cards_incorrect').notNull().default(0),
     status: text('status', { enum: ['active', 'completed', 'abandoned'] }).notNull().default('active'),
     queueSnapshot: text('queue_snapshot'),
+    userId: integer('user_id').references(() => users.id, { onDelete: 'cascade' }),
   },
-  (t) => ({ statusIdx: index('sessions_status_idx').on(t.status) })
+  (t) => ({
+    statusIdx: index('sessions_status_idx').on(t.status),
+    userIdx: index('sessions_user_idx').on(t.userId, t.status),
+  })
 );
 
 export const attempts = sqliteTable(
@@ -130,6 +148,23 @@ export const authTokens = sqliteTable(
   })
 );
 
+export const lessonSubscriptions = sqliteTable(
+  'lesson_subscriptions',
+  {
+    id: integer('id').primaryKey({ autoIncrement: true }),
+    userId: integer('user_id').notNull().references(() => users.id, { onDelete: 'cascade' }),
+    lessonId: integer('lesson_id').notNull().references(() => lessons.id, { onDelete: 'cascade' }),
+    createdAt: integer('created_at').notNull().default(sql`(unixepoch())`),
+  },
+  (t) => ({
+    userIdx: index('lesson_subscriptions_user_idx').on(t.userId),
+    lessonIdx: index('lesson_subscriptions_lesson_idx').on(t.lessonId),
+    userLessonUnique: uniqueIndex('lesson_subscriptions_user_lesson_unique').on(t.userId, t.lessonId),
+  })
+);
+
+export type LessonSubscriptionRow = typeof lessonSubscriptions.$inferSelect;
+
 export type LessonRow = typeof lessons.$inferSelect;
 export type CardRow = typeof cards.$inferSelect;
 export type CardProgressRow = typeof cardProgress.$inferSelect;