migrations: change symbol_history.id to BIGINT

The symbol_history.id column is changed from an INT to a BIGINT.

Rather than change the column type, we drop the entire table since
we need to reprocess everything anyways.

For golang/go#37102

Change-Id: I8aedaf73bfd41b71005d630c011c92da1686f580
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/315709
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

migrations/000094_alter_symbol_history.down.sql

@@ -0,0 +1,30 @@
+-- Copyright 2021 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+BEGIN;
+
+DROP TABLE symbol_history;
+CREATE TABLE symbol_history (
+    id INTEGER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    created_at timestamp with time zone DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at timestamp with time zone DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    package_path_id INTEGER NOT NULL,
+    module_path_id INTEGER NOT NULL,
+    symbol_name_id INTEGER NOT NULL,
+    parent_symbol_name_id INTEGER NOT NULL,
+    package_symbol_id INTEGER NOT NULL,
+    since_version TEXT NOT NULL CHECK(since_version != ''),
+    sort_version text NOT NULL,
+    goos goos NOT NULL,
+    goarch goarch NOT NULL,
+
+    UNIQUE( package_path_id, module_path_id, symbol_name_id, goos, goarch),
+    FOREIGN KEY (package_path_id) REFERENCES paths(id) ON DELETE CASCADE,
+    FOREIGN KEY (module_path_id) REFERENCES paths(id) ON DELETE CASCADE,
+    FOREIGN KEY (symbol_name_id) REFERENCES symbol_names(id) ON DELETE CASCADE,
+    FOREIGN KEY (parent_symbol_name_id) REFERENCES symbol_names(id) ON DELETE CASCADE,
+    FOREIGN KEY (package_symbol_id) REFERENCES package_symbols(id) ON DELETE CASCADE
+);
+
+END;

migrations/000094_alter_symbol_history.up.sql

@@ -0,0 +1,30 @@
+-- Copyright 2021 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+BEGIN;
+
+DROP TABLE symbol_history;
+CREATE TABLE symbol_history (
+    id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
+    created_at timestamp with time zone DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at timestamp with time zone DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    package_path_id INTEGER NOT NULL,
+    module_path_id INTEGER NOT NULL,
+    symbol_name_id INTEGER NOT NULL,
+    parent_symbol_name_id INTEGER NOT NULL,
+    package_symbol_id INTEGER NOT NULL,
+    since_version TEXT NOT NULL CHECK(since_version != ''),
+    sort_version text NOT NULL,
+    goos goos NOT NULL,
+    goarch goarch NOT NULL,
+
+    UNIQUE( package_path_id, module_path_id, symbol_name_id, goos, goarch),
+    FOREIGN KEY (package_path_id) REFERENCES paths(id) ON DELETE CASCADE,
+    FOREIGN KEY (module_path_id) REFERENCES paths(id) ON DELETE CASCADE,
+    FOREIGN KEY (symbol_name_id) REFERENCES symbol_names(id) ON DELETE CASCADE,
+    FOREIGN KEY (parent_symbol_name_id) REFERENCES symbol_names(id) ON DELETE CASCADE,
+    FOREIGN KEY (package_symbol_id) REFERENCES package_symbols(id) ON DELETE CASCADE
+);
+
+END;