feat: add visibility feature to thoughts, including new enum, database migration, and update related endpoints and tests

thoughts-backend/migration/src/m20250906_145755_add_visibility_to_thoughts.rs

@@ -0,0 +1,59 @@
+use super::m20250905_000001_init::Thought;
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .get_connection()
+            .execute_unprepared(
+                "CREATE TYPE thought_visibility AS ENUM ('public', 'friends_only', 'private')",
+            )
+            .await?;
+
+        // 2. Add the new column to the thoughts table
+        manager
+            .alter_table(
+                Table::alter()
+                    .table(Thought::Table)
+                    .add_column(
+                        ColumnDef::new(ThoughtExtension::Visibility)
+                            .enumeration(
+                                "thought_visibility",
+                                ["public", "friends_only", "private"],
+                            )
+                            .not_null()
+                            .default("public"), // Default new thoughts to public
+                    )
+                    .to_owned(),
+            )
+            .await
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .alter_table(
+                Table::alter()
+                    .table(Thought::Table)
+                    .drop_column(ThoughtExtension::Visibility)
+                    .to_owned(),
+            )
+            .await?;
+
+        // Drop the ENUM type
+        manager
+            .get_connection()
+            .execute_unprepared("DROP TYPE thought_visibility")
+            .await?;
+
+        Ok(())
+    }
+}
+
+#[derive(DeriveIden)]
+enum ThoughtExtension {
+    Visibility,
+}