Implement file sharing functionality with public share links and associated API endpoints

go_cloud/migrations/0007_file_share_links.sql

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+-- Create file_share_links table
+
+CREATE TABLE file_share_links (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    token TEXT NOT NULL UNIQUE,
+    file_id UUID NOT NULL REFERENCES files(id) ON DELETE CASCADE,
+    org_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
+    created_by_user_id UUID NOT NULL REFERENCES users(id),
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    expires_at TIMESTAMP WITH TIME ZONE,
+    is_revoked BOOLEAN DEFAULT FALSE
+);
+
+CREATE INDEX idx_file_share_links_token ON file_share_links(token);
+CREATE INDEX idx_file_share_links_file_id ON file_share_links(file_id);
+CREATE INDEX idx_file_share_links_org_id ON file_share_links(org_id);

go_cloud/migrations/0007_file_share_links_down.sql

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+-- Drop file_share_links table
+
+DROP TABLE IF EXISTS file_share_links;
+    expires_at TIMESTAMP WITH TIME ZONE,
+    is_revoked BOOLEAN DEFAULT FALSE
+);
+
+CREATE INDEX idx_file_share_links_token ON file_share_links(token);
+CREATE INDEX idx_file_share_links_file_id ON file_share_links(file_id);
+CREATE INDEX idx_file_share_links_org_id ON file_share_links(org_id);

go_cloud/migrations/0007_file_share_links_down.sql.bak

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+-- Drop file_share_links table
+
+DROP TABLE IF EXISTS file_share_links;