Add Shell Society nomination flow

drizzle/0004_puzzling_omega_flight.sql

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+CREATE TABLE `nomination_approvals` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`nomination_id` integer NOT NULL,
+	`approver_id` text NOT NULL,
+	`created_at` text DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')) NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `idx_nomination_approvals_nomination_approver` ON `nomination_approvals` (`nomination_id`,`approver_id`);--> statement-breakpoint
+CREATE INDEX `idx_nomination_approvals_nomination_id` ON `nomination_approvals` (`nomination_id`);--> statement-breakpoint
+CREATE TABLE `nominations` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`guild_id` text NOT NULL,
+	`channel_id` text NOT NULL,
+	`nominee_id` text NOT NULL,
+	`nominator_id` text NOT NULL,
+	`target_role_id` text NOT NULL,
+	`required_approvals` integer NOT NULL,
+	`status` text DEFAULT 'submitted' NOT NULL,
+	`completed_at` text,
+	`created_at` text DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')) NOT NULL,
+	`updated_at` text DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')) NOT NULL
+);
+--> statement-breakpoint
+CREATE INDEX `idx_nominations_guild_nominee_status` ON `nominations` (`guild_id`,`nominee_id`,`status`);--> statement-breakpoint
+CREATE INDEX `idx_nominations_status` ON `nominations` (`status`);

drizzle/0005_lethal_senator_kelly.sql

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+ALTER TABLE `nominations` ADD `reason` text DEFAULT 'No reason provided.' NOT NULL;

drizzle/0006_clean_prism.sql

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+DROP INDEX `idx_nominations_guild_nominee_status`;--> statement-breakpoint
+CREATE UNIQUE INDEX `idx_nominations_submitted_unique` ON `nominations` (`guild_id`,`nominee_id`,`target_role_id`) WHERE "nominations"."status" = 'submitted';

drizzle/0007_overrated_mauler.sql

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+ALTER TABLE `nominations` ADD `message_id` text;--> statement-breakpoint
+ALTER TABLE `nominations` ADD `expires_at` text;--> statement-breakpoint
+UPDATE `nominations` SET `expires_at` = strftime('%Y-%m-%dT%H:%M:%fZ', `created_at`, '+48 hours') WHERE `expires_at` IS NULL;