add activity table

essays/drizzle-gotchas.md

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+## Drizzle
+
+### LibsqlError: SQL_NO_STATEMENT: SQL string does not contain any statemen
+
+- the last statement cannot be `--> statement-breakpoint`

migrations/0001_plain_stingray.sql

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+CREATE TABLE `activity`(
+    `id` text PRIMARY KEY NOT NULL,
+    `action` text NOT NULL,
+    `card_id` text NOT NULL,
+    `user_id` text NOT NULL,
+    `created_at` integer DEFAULT (unixepoch()) NOT NULL,
+    FOREIGN KEY (`card_id`) REFERENCES `card`(`id`) ON UPDATE NO action ON DELETE NO action,
+    FOREIGN KEY (`user_id`) REFERENCES `auth_user`(`id`) ON UPDATE NO action ON DELETE NO action
+);
+
+--> statement-breakpoint
+CREATE TRIGGER log_card_insert
+    AFTER INSERT ON card
+BEGIN
+    INSERT INTO activity(id,
+    action,
+    card_id,
+    user_id,
+    created_at)
+VALUES(lower(hex(randomblob(16))),
+    'INSERT',
+    NEW.id,
+    NEW.user_id,
+    strftime('%s', 'now'));
+
+END;
+
+--> statement-breakpoint
+CREATE TRIGGER log_card_update
+    AFTER UPDATE ON card
+BEGIN
+    INSERT INTO activity(id,
+    action,
+    card_id,
+    user_id,
+    created_at)
+VALUES(lower(hex(randomblob(16))),
+    'UPDATE',
+    NEW.id,
+    NEW.user_id,
+    strftime('%s', 'now'));
+
+END;
+
+--> statement-breakpoint
+CREATE TRIGGER log_card_delete
+    AFTER DELETE ON card
+BEGIN
+    INSERT INTO activity(id,
+    action,
+    card_id,
+    user_id,
+    created_at)
+VALUES(lower(hex(randomblob(16))),
+    'DELETE',
+    OLD.id,
+    OLD.user_id,
+    strftime('%s', 'now'));
+
+END;
+