add basic guild create + message create endpoints

chat/src/db/message.rs

@@ -0,0 +1,33 @@
+use chrono::{DateTime, Utc};
+use eyre::Result;
+use foxchat::model::http::channel::CreateMessageParams;
+use sqlx::PgExecutor;
+use ulid::Ulid;
+
+pub struct Message {
+    pub id: String,
+    pub channel_id: String,
+    pub author_id: String,
+    pub updated_at: DateTime<Utc>,
+    pub content: String,
+}
+
+pub async fn create_message(
+    executor: impl PgExecutor<'_>,
+    channel_id: &str,
+    user_id: &str,
+    params: CreateMessageParams,
+) -> Result<Message> {
+    let message = sqlx::query_as!(
+        Message,
+        "insert into messages (id, channel_id, author_id, content) values ($1, $2, $3, $4) returning *",
+        Ulid::new().to_string(),
+        channel_id,
+        user_id,
+        params.content,
+    )
+    .fetch_one(executor)
+    .await?;
+
+    Ok(message)
+}