Add check constraints for unsigned integers in PostgreSQL schema

Database/PostgreSQL.sql

@@ -5,25 +5,25 @@
 BEGIN;
 
 CREATE TABLE IF NOT EXISTS "users" (
-	"id" SERIAL PRIMARY KEY,
+	"id" SERIAL PRIMARY KEY CHECK ("id" >= 0),
 	"email" VARCHAR(249) UNIQUE NOT NULL,
 	"password" VARCHAR(255) NOT NULL,
 	"username" VARCHAR(100) DEFAULT NULL,
-	"status" SMALLINT NOT NULL DEFAULT '0',
+	"status" SMALLINT NOT NULL DEFAULT '0' CHECK ("status" >= 0),
-	"verified" SMALLINT NOT NULL DEFAULT '0',
+	"verified" SMALLINT NOT NULL DEFAULT '0' CHECK ("verified" >= 0),
-	"resettable" SMALLINT NOT NULL DEFAULT '1',
+	"resettable" SMALLINT NOT NULL DEFAULT '1' CHECK ("resettable" >= 0),
-	"roles_mask" INTEGER NOT NULL DEFAULT '0',
+	"roles_mask" INTEGER NOT NULL DEFAULT '0' CHECK ("roles_mask" >= 0),
-	"registered" INTEGER NOT NULL,
+	"registered" INTEGER NOT NULL CHECK ("registered" >= 0),
-	"last_login" INTEGER DEFAULT NULL
+	"last_login" INTEGER DEFAULT NULL CHECK ("last_login" >= 0)
 );
 
 CREATE TABLE IF NOT EXISTS "users_confirmations" (
-	"id" SERIAL PRIMARY KEY,
+	"id" SERIAL PRIMARY KEY CHECK ("id" >= 0),
-	"user_id" INTEGER NOT NULL,
+	"user_id" INTEGER NOT NULL CHECK ("user_id" >= 0),
 	"email" VARCHAR(249) NOT NULL,
 	"selector" VARCHAR(16) UNIQUE NOT NULL,
 	"token" VARCHAR(255) NOT NULL,
-	"expires" INTEGER NOT NULL
+	"expires" INTEGER NOT NULL CHECK ("expires" >= 0)
 );
 
 CREATE INDEX IF NOT EXISTS "email_expires" ON "users_confirmations" ("email", "expires");
@@ -31,30 +31,30 @@ CREATE INDEX IF NOT EXISTS "email_expires" ON "users_confirmations" ("email", "e
 CREATE INDEX IF NOT EXISTS "user_id" ON "users_confirmations" ("user_id");
 
 CREATE TABLE IF NOT EXISTS "users_remembered" (
-	"id" BIGSERIAL PRIMARY KEY,
+	"id" BIGSERIAL PRIMARY KEY CHECK ("id" >= 0),
-	"user" INTEGER NOT NULL,
+	"user" INTEGER NOT NULL CHECK ("user" >= 0),
 	"selector" VARCHAR(24) UNIQUE NOT NULL,
 	"token" VARCHAR(255) NOT NULL,
-	"expires" INTEGER NOT NULL
+	"expires" INTEGER NOT NULL CHECK ("expires" >= 0)
 );
 
 CREATE INDEX IF NOT EXISTS "user" ON "users_remembered" ("user");
 
 CREATE TABLE IF NOT EXISTS "users_resets" (
-	"id" BIGSERIAL PRIMARY KEY,
+	"id" BIGSERIAL PRIMARY KEY CHECK ("id" >= 0),
-	"user" INTEGER NOT NULL,
+	"user" INTEGER NOT NULL CHECK ("user" >= 0),
 	"selector" VARCHAR(20) UNIQUE NOT NULL,
 	"token" VARCHAR(255) NOT NULL,
-	"expires" INTEGER NOT NULL
+	"expires" INTEGER NOT NULL CHECK ("expires" >= 0)
 );
 
 CREATE INDEX IF NOT EXISTS "user_expires" ON "users_resets" ("user", "expires");
 
 CREATE TABLE IF NOT EXISTS "users_throttling" (
 	"bucket" VARCHAR(44) PRIMARY KEY,
-	"tokens" REAL NOT NULL,
+	"tokens" REAL NOT NULL CHECK ("tokens" >= 0),
-	"replenished_at" INTEGER NOT NULL,
+	"replenished_at" INTEGER NOT NULL CHECK ("replenished_at" >= 0),
-	"expires_at" INTEGER NOT NULL
+	"expires_at" INTEGER NOT NULL CHECK ("expires_at" >= 0)
 );
 
 CREATE INDEX IF NOT EXISTS "expires_at" ON "users_throttling" ("expires_at");