pastes: Add schema and some db ops

Signed-off-by: ATechnoHazard <amolele@gmail.com>

src/core/paste/diesel.rs

@@ -0,0 +1,11 @@
+use diesel::pg::PgConnection;
+use diesel::result::Error;
+use super::entity::Paste;
+use crate::schema::pastes;
+use diesel::{RunQueryDsl, QueryResult};
+
+pub fn create(paste: &Paste, conn: &PgConnection) -> Result<usize, Error> {
+    diesel::insert_into(pastes::table)
+        .values(paste)
+        .execute(conn)
+}

src/core/paste/entity.rs

@@ -0,0 +1,10 @@
+use crate::schema::pastes;
+
+#[table_name="pastes"]
+#[derive(AsChangeset, Serialize, Deserialize, Queryable, Insertable)]
+pub struct Paste {
+    id: String,
+    belongs_to: String,
+    is_url: bool,
+    content: String
+}