diff --git a/deltachat_derive/src/lib.rs b/deltachat_derive/src/lib.rs
index 6fde011b7..f911b9fa9 100644
--- a/deltachat_derive/src/lib.rs
+++ b/deltachat_derive/src/lib.rs
@@ -36,7 +36,7 @@ pub fn from_sql_derive(input: TokenStream) -> TokenStream {
         impl rusqlite::types::FromSql for #name {
             fn column_result(col: rusqlite::types::ValueRef) -> rusqlite::types::FromSqlResult<Self> {
                 let inner = rusqlite::types::FromSql::column_result(col)?;
-                num_traits::FromPrimitive::from_i64(inner).ok_or(rusqlite::types::FromSqlError::InvalidType)
+                Ok(num_traits::FromPrimitive::from_i64(inner).unwrap_or_default())
             }
         }
     };
diff --git a/src/constants.rs b/src/constants.rs
index 595fcab41..6a066351e 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -18,6 +18,12 @@ pub enum MoveState {
     Moving = 3,
 }
 
+impl Default for MoveState {
+    fn default() -> Self {
+        MoveState::Undefined
+    }
+}
+
 // some defaults
 const DC_E2EE_DEFAULT_ENABLED: i32 = 1;
 pub const DC_MDNS_DEFAULT_ENABLED: i32 = 1;
@@ -220,6 +226,12 @@ pub enum Viewtype {
     File = 60,
 }
 
+impl Default for Viewtype {
+    fn default() -> Self {
+        Viewtype::Unknown
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/contact.rs b/src/contact.rs
index 8f8e0d805..0e7371ae5 100644
--- a/src/contact.rs
+++ b/src/contact.rs
@@ -1,7 +1,6 @@
+use deltachat_derive::*;
 use itertools::Itertools;
-use num_traits::{FromPrimitive, ToPrimitive};
 use rusqlite;
-use rusqlite::types::*;
 
 use crate::aheader::EncryptPreference;
 use crate::config::Config;
@@ -58,7 +57,9 @@ pub struct Contact<'a> {
 }
 
 /// Possible origins of a contact.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, FromPrimitive, ToPrimitive)]
+#[derive(
+    Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, FromPrimitive, ToPrimitive, FromSql, ToSql,
+)]
 #[repr(i32)]
 pub enum Origin {
     Unknown = 0,
@@ -96,23 +97,9 @@ pub enum Origin {
     ManuallyCreated = 0x4000000,
 }
 
-impl ToSql for Origin {
-    fn to_sql(&self) -> rusqlite::Result<ToSqlOutput> {
-        let num: i64 = self
-            .to_i64()
-            .expect("impossible: Origin -> i64 conversion failed");
-
-        Ok(ToSqlOutput::Owned(Value::Integer(num)))
-    }
-}
-
-impl FromSql for Origin {
-    fn column_result(col: ValueRef) -> FromSqlResult<Self> {
-        let inner = FromSql::column_result(col)?;
-        match FromPrimitive::from_i64(inner) {
-            Some(res) => Ok(res),
-            None => Ok(Origin::Unknown),
-        }
+impl Default for Origin {
+    fn default() -> Self {
+        Origin::Unknown
     }
 }
 
diff --git a/src/job.rs b/src/job.rs
index bacb73c1b..905d270cd 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -25,13 +25,22 @@ use crate::x::*;
 #[derive(Debug, Display, Copy, Clone, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
 #[repr(i32)]
 enum Thread {
+    Unknown = 0,
     Imap = 100,
     Smtp = 5000,
 }
 
+impl Default for Thread {
+    fn default() -> Self {
+        Thread::Unknown
+    }
+}
+
 #[derive(Debug, Display, Copy, Clone, PartialEq, Eq, FromPrimitive, ToPrimitive, FromSql, ToSql)]
 #[repr(i32)]
 pub enum Action {
+    Unknown = 0,
+
     // Jobs in the INBOX-thread, range from DC_IMAP_THREAD..DC_IMAP_THREAD+999
     Housekeeping = 105, // low priority ...
     DeleteMsgOnImap = 110,
@@ -50,11 +59,19 @@ pub enum Action {
     SendMsgToSmtp = 5901, // ... high priority
 }
 
+impl Default for Action {
+    fn default() -> Self {
+        Action::Unknown
+    }
+}
+
 impl From<Action> for Thread {
     fn from(action: Action) -> Thread {
         use Action::*;
 
         match action {
+            Unknown => Thread::Unknown,
+
             Housekeeping => Thread::Imap,
             DeleteMsgOnImap => Thread::Imap,
             MarkseenMdnOnImap => Thread::Imap,
@@ -844,6 +861,9 @@ fn job_perform(context: &Context, thread: Thread, probe_network: bool) {
             job.try_again = 0;
 
             match job.action {
+                Action::Unknown => {
+                    warn!(context, 0, "Unknown job id found");
+                }
                 Action::SendMsgToSmtp => job.do_DC_JOB_SEND(context),
                 Action::DeleteMsgOnImap => job.do_DC_JOB_DELETE_MSG_ON_IMAP(context),
                 Action::MarkseenMsgOnImap => job.do_DC_JOB_MARKSEEN_MSG_ON_IMAP(context),
@@ -1062,6 +1082,11 @@ pub fn job_add(
     param: Params,
     delay_seconds: i64,
 ) {
+    if action != Action::Unknown {
+        error!(context, 0, "Invalid action passed to job_add");
+        return;
+    }
+
     let timestamp = time();
     let thread: Thread = action.into();
 
@@ -1082,6 +1107,7 @@ pub fn job_add(
     match thread {
         Thread::Imap => interrupt_imap_idle(context),
         Thread::Smtp => interrupt_smtp_idle(context),
+        Thread::Unknown => {}
     }
 }
 
diff --git a/src/message.rs b/src/message.rs
index 89ecd00b3..92227cdca 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -38,6 +38,12 @@ pub enum MessageState {
     OutMdnRcvd = 28,
 }
 
+impl Default for MessageState {
+    fn default() -> Self {
+        MessageState::Undefined
+    }
+}
+
 impl From<MessageState> for LotState {
     fn from(s: MessageState) -> Self {
         use MessageState::*;