Don't overwrite already resolved participants, better naming of keys

kordophone-db/migrations/2025-06-26-233940_create_schema/up.sql

@@ -0,0 +1,46 @@
+-- Your SQL goes here
+CREATE TABLE `messages`(
+	`id` TEXT NOT NULL PRIMARY KEY,
+	`text` TEXT NOT NULL,
+	`sender_participant_handle` TEXT,
+	`date` TIMESTAMP NOT NULL,
+	`file_transfer_guids` TEXT,
+	`attachment_metadata` TEXT,
+	FOREIGN KEY (`sender_participant_handle`) REFERENCES `participants`(`handle`)
+);
+
+CREATE TABLE `conversation_messages`(
+	`conversation_id` TEXT NOT NULL,
+	`message_id` TEXT NOT NULL,
+	PRIMARY KEY(`conversation_id`, `message_id`),
+	FOREIGN KEY (`conversation_id`) REFERENCES `conversations`(`id`),
+	FOREIGN KEY (`message_id`) REFERENCES `messages`(`id`)
+);
+
+CREATE TABLE `settings`(
+	`key` TEXT NOT NULL PRIMARY KEY,
+	`value` BINARY NOT NULL
+);
+
+CREATE TABLE `conversations`(
+	`id` TEXT NOT NULL PRIMARY KEY,
+	`unread_count` BIGINT NOT NULL,
+	`display_name` TEXT,
+	`last_message_preview` TEXT,
+	`date` TIMESTAMP NOT NULL
+);
+
+CREATE TABLE `participants`(
+	`handle` TEXT NOT NULL PRIMARY KEY,
+	`is_me` BOOL NOT NULL,
+	`contact_id` TEXT
+);
+
+CREATE TABLE `conversation_participants`(
+	`conversation_id` TEXT NOT NULL,
+	`participant_handle` TEXT NOT NULL,
+	PRIMARY KEY(`conversation_id`, `participant_handle`),
+	FOREIGN KEY (`conversation_id`) REFERENCES `conversations`(`id`),
+	FOREIGN KEY (`participant_handle`) REFERENCES `participants`(`handle`)
+);
+