feat: rewrite user model using diesel

migrations/2025-01-13-114912_create_plants/up.sql

@@ -1,5 +1,5 @@
 create table plants (
-    id integer primary key not null,
+    id bigint primary key not null,
     name text not null,
     species text not null,
     description text not null

migrations/2025-01-13-115415_create_comments/up.sql

@@ -1,5 +1,7 @@
 create table comments (
-    id integer primary key not null,
-    plant_id integer references plants (id),
+    id bigint primary key not null,
+    plant_id bigint not null
+        references plants (id)
+        on delete cascade,
     comment text not null
 );

migrations/2025-01-13-115505_create_events/up.sql

@@ -1,6 +1,6 @@
 create table events (
-    id integer primary key not null,
-    plant_id integer not null
+    id bigint primary key not null,
+    plant_id bigint not null
         references plants (id)
         on delete cascade,
     event_type text not null,

migrations/2025-01-13-115534_add_auth/up.sql

@@ -1,13 +1,13 @@
 create table users (
-    id integer primary key not null,
+    id bigint primary key not null,
     username text unique not null,
     password_hash text not null,
     admin boolean not null
 );
 
 create table sessions (
-    id integer primary key not null,
-    user_id integer not null
+    id bigint primary key not null,
+    user_id bigint not null
         references users (id)
         on delete cascade,
     unique (id, user_id)