New database tables for auction and solver competition

database/sql/V072__auction_solution_orders.sql

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+-- Rename current `auctions` table to `auction` since it always contains only the latest auction
+ALTER TABLE auctions RENAME TO auction;
+
+CREATE TABLE auctions (
+   auction_id bigint PRIMARY KEY,
+   -- The block number at which the auction was created
+   block bigint NOT NULL,
+   -- The block number until which all winning solutions from a competition should be settled on-chain
+   deadline bigint NOT NULL
+);
+
+-- Table to store all proposed solutions for an auction, received from solvers during competition time.
+-- A single auction can have multiple solutions, and each solution can contain multiple order executions.
+-- This design allows for multiple solutions from a single solver
+CREATE TABLE proposed_solutions (
+   auction_id bigint NOT NULL,
+   -- The block number until which the solutions should be settled
+   -- Not NULL for winning orders
+   deadline bigint,
+   -- solver submission address
+   solver bytea NOT NULL,
+   -- Has to be unique accross auctions (hash of the (auction_id + solver + solutionId received from solver)?)
+   solution_id numeric NOT NULL,
+   -- Whether the solution is one of the winning solutions of the auction
+   is_winner boolean NOT NULL,
+
+   PRIMARY (auction_id, solution_id)
+);
+
+-- For performant filtering of solutions by auction_id and JOINs on auction_id
+CREATE INDEX idx_auction_id ON proposed_solutions(auction_id);
+
+-- Table to store all order executions of a solution
+CREATE TABLE proposed_solution_executions (
+   auction_id bigint NOT NULL,
+   solution_id numeric NOT NULL,
+   order_uid bytea NOT NULL,
+   sell_token bytea NOT NULL,
+   buy_token bytea NOT NULL,
+   limit_sell numeric(78,0) NOT NULL,
+   limit_buy numeric(78,0) NOT NULL,
+   side OrderKind NOT NULL,
+   -- Uniform clearing price of the sell token
+   sell_token_price numeric(78,0) NOT NULL,
+   -- Uniform clearing price of the buy token
+   buy_token_price numeric(78,0) NOT NULL,
+   -- The effective amount that left the user's wallet including all fees.
+   executed_sell numeric(78,0) NOT NULL,
+   -- The effective amount the user received after all fees.
+   executed_buy numeric(78,0) NOT NULL,
+
+   PRIMARY (auction_id, solution_id, order_uid)
+);
+
+-- For performant JOINs on auction_id
+CREATE INDEX idx_auction_id_solution_id_on_execution ON proposed_solution_executions(auction_id, solution_id);