Add schema for tracker-to-vendor mapping

Introduces common_third_party_domains (CITEXT domain aliases per
third party), common_tracker_patterns (global tracker knowledge
base), and new FK columns on tracker_patterns (third_party_id,
common_tracker_pattern_id), vendors (common_third_party_id), and
detected_trackers (initiator_domain) to support automated
tracker-to-vendor attribution.

Signed-off-by: Émile Ré <emile@getprobo.com>
Signed-off-by: Émile Ré <emile@probo.com>

pkg/coredata/migrations/20260513T105453Z.sql

@@ -0,0 +1,66 @@
+-- Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+-- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+-- AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+-- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+-- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+-- OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+-- PERFORMANCE OF THIS SOFTWARE.
+
+-- common_third_party_domains: maps all known eTLD+1 domains operated by a
+-- third party (e.g. Google owns googletagmanager.com, google-analytics.com,
+-- doubleclick.net). Used for fast domain-based tracker attribution.
+CREATE TABLE common_third_party_domains (
+    id                    TEXT PRIMARY KEY,
+    common_third_party_id TEXT NOT NULL REFERENCES common_third_parties(id) ON DELETE CASCADE,
+    domain                CITEXT NOT NULL,
+    created_at            TIMESTAMP WITH TIME ZONE NOT NULL,
+    updated_at            TIMESTAMP WITH TIME ZONE NOT NULL
+);
+
+CREATE UNIQUE INDEX common_third_party_domains_domain_key
+    ON common_third_party_domains (domain);
+
+CREATE INDEX idx_common_third_party_domains_third_party
+    ON common_third_party_domains (common_third_party_id);
+
+-- common_tracker_patterns: global (not tenant/org scoped) knowledge base of
+-- tracker patterns linked to third parties. Grows over time as we discover
+-- new tracker-to-vendor mappings.
+CREATE TABLE common_tracker_patterns (
+    id                    TEXT PRIMARY KEY,
+    common_third_party_id TEXT REFERENCES common_third_parties(id) ON DELETE SET NULL,
+    tracker_type          tracker_type NOT NULL,
+    pattern               TEXT NOT NULL,
+    match_type            cookie_pattern_match_type NOT NULL,
+    description           TEXT NOT NULL DEFAULT '',
+    max_age_seconds       INTEGER,
+    confidence            REAL NOT NULL DEFAULT 0,
+    created_at            TIMESTAMP WITH TIME ZONE NOT NULL,
+    updated_at            TIMESTAMP WITH TIME ZONE NOT NULL
+);
+
+CREATE UNIQUE INDEX idx_common_tracker_patterns_unique
+    ON common_tracker_patterns (tracker_type, pattern, COALESCE(max_age_seconds, -1));
+
+-- Link tracker_patterns to the common knowledge base and to vendors.
+ALTER TABLE tracker_patterns
+    ADD COLUMN common_tracker_pattern_id  TEXT REFERENCES common_tracker_patterns(id) ON DELETE SET NULL,
+    ADD COLUMN third_party_id             TEXT REFERENCES vendors(id) ON DELETE SET NULL;
+
+-- Link vendors to the common third party they were created from.
+ALTER TABLE vendors
+    ADD COLUMN common_third_party_id TEXT REFERENCES common_third_parties(id) ON DELETE SET NULL;
+
+-- Pre-extracted eTLD+1 for fast domain-based joins in the mapping worker.
+ALTER TABLE detected_trackers
+    ADD COLUMN initiator_domain CITEXT;
+
+CREATE INDEX idx_detected_trackers_initiator_domain
+    ON detected_trackers (initiator_domain)
+    WHERE initiator_domain IS NOT NULL;