kpcli: adds 'db' subcommand for interacting with the database

kordophone-db/src/models/conversation.rs

@@ -1,4 +1,4 @@
-use chrono::NaiveDateTime;
+use chrono::{DateTime, NaiveDateTime};
 use uuid::Uuid;
 use crate::models::participant::Participant;
 
@@ -29,6 +29,29 @@ impl Conversation {
     }
 }
 
+impl From<kordophone::model::Conversation> for Conversation {
+    fn from(value: kordophone::model::Conversation) -> Self {
+        Self {
+            guid: value.guid,
+            unread_count: u16::try_from(value.unread_count).unwrap(), 
+            display_name: value.display_name,
+            last_message_preview: value.last_message_preview,
+            date: DateTime::from_timestamp(
+                value.date.unix_timestamp(),
+                value.date.unix_timestamp_nanos()
+                    .try_into()
+                    .unwrap_or(0),
+                )
+                .unwrap()
+                .naive_local(),
+            participants: value.participant_display_names
+                .into_iter()
+                .map(|p| p.into())
+                .collect(),
+        }
+    }
+}
+
 #[derive(Default)]
 pub struct ConversationBuilder {
     guid: Option<String>,