First pass implementation of an SQLite backing store for fetched opportunities

internal/store/migrations/00001_create_opportunities_table.sql

@@ -0,0 +1,40 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS "opportunities" (
+	-- Surrogate key. "uuid" is the real identifier; "id" exists only to give
+	-- the title search index (opportunities_fts) a stable rowid to point at.
+	"id" INTEGER PRIMARY KEY,
+	"uuid" TEXT NOT NULL UNIQUE,
+	"uuid_type" TEXT NOT NULL,
+	"title" TEXT NOT NULL,
+	"status" TEXT NOT NULL,
+	"description" TEXT NOT NULL DEFAULT '',
+	"buyer_name" TEXT NOT NULL DEFAULT '',
+	-- classifications: see tender_classifications
+	"buyer_id" TEXT NOT NULL DEFAULT '',
+	"main_category" TEXT NOT NULL DEFAULT '',
+	"procurement_method" TEXT NOT NULL DEFAULT '',
+	"multi_lot" BOOLEAN NOT NULL DEFAULT FALSE,
+	"sme_suitable" BOOLEAN NOT NULL DEFAULT FALSE,
+	"vcse_suitable" BOOLEAN NOT NULL DEFAULT FALSE,
+	"start_date" DATETIME,
+	"end_date" DATETIME,
+	"gross_value" REAL NOT NULL DEFAULT 0,
+	"has_documents" BOOLEAN NOT NULL DEFAULT FALSE,
+	"source" TEXT NOT NULL DEFAULT '',
+	-- Release date of the newest release applied to this row. A release
+	-- older than this never overwrites the tender.
+	"latest_release_date" DATETIME NOT NULL
+	-- releases: see tender_ocds_releases
+);
+
+CREATE INDEX IF NOT EXISTS "opportunities_status"
+	ON "opportunities" ("status");
+CREATE INDEX IF NOT EXISTS "opportunities_latest_release_date"
+	ON "opportunities" ("latest_release_date");
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP TABLE IF EXISTS "opportunities";
+-- +goose StatementEnd