first commit

migrations/V010__contact_groups.sql

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+CREATE TABLE IF NOT EXISTS contact_groups (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL UNIQUE,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE TABLE IF NOT EXISTS contact_group_members (
+    group_id TEXT NOT NULL,
+    contact_id TEXT NOT NULL,
+    PRIMARY KEY (group_id, contact_id),
+    FOREIGN KEY (group_id) REFERENCES contact_groups(id) ON DELETE CASCADE,
+    FOREIGN KEY (contact_id) REFERENCES contacts(id) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_cgm_contact_id ON contact_group_members(contact_id);