diff --git a/core/sql/0001_initial_schema.sql b/core/sql/0001_initial_schema.sql
index 1641210..a80e9a3 100644
--- a/core/sql/0001_initial_schema.sql
+++ b/core/sql/0001_initial_schema.sql
@@ -2,21 +2,24 @@ create table sources(
     name text not null,
     state blob,
     lastUpdated int not null,
-    primary key (name)
+    primary key (name),
+    check (name <> '')
 ) strict;
 create table actions(
     source text not null,
     name text not null,
     argv blob not null,
     unique (source, name) on conflict replace,
-    foreign key (source) references sources (name) on delete cascade
+    foreign key (source) references sources (name) on delete cascade,
+    check (name <> '')
 ) strict;
 create table envs(
     source text not null,
     name text not null,
     value text not null,
     unique (source, name) on conflict replace,
-    foreign key (source) references sources (name) on delete cascade
+    foreign key (source) references sources (name) on delete cascade,
+    check (name <> '')
 ) strict;
 create table items(
     source text not null,
@@ -33,13 +36,15 @@ create table items(
     tts int,
     action blob,
     primary key (source, id),
-    foreign key (source) references sources (name) on delete cascade
+    foreign key (source) references sources (name) on delete cascade,
+    check (id <> '')
 ) strict;
 create table channels(
     name text not null,
     source text not null,
     unique (name, source) on conflict replace
-    foreign key (source) references sources (name) on delete cascade
+    foreign key (source) references sources (name) on delete cascade,
+    check (name <> '')
 ) strict;
 create table password(
     id int not null,