#!/usr/bin/env tclsh

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/sqlite3/tester.tcl

do_execsql_test_on_specific_db {:memory:} fk-basic-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t (id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE t2 (id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t VALUES (1,'x'),(2,'y');
    INSERT INTO t2 VALUES (10,1),(11,NULL);    -- NULL child ok
    SELECT id,tid FROM t2 ORDER BY id;
} {10|1
11|}

do_execsql_test_in_memory_any_error fk-insert-child-missing-parent {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t (id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE t2 (id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t2 VALUES (20,99);
}

do_execsql_test_in_memory_any_error fk-update-child-to-missing-parent {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t (id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE t2 (id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t VALUES (1,'x');
    INSERT INTO t2 VALUES (10,1);
    UPDATE t2 SET tid = 42 WHERE id = 10;      -- now missing
}

do_execsql_test_on_specific_db {:memory:} fk-update-child-to-null-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t (id INTEGER PRIMARY KEY);
    CREATE TABLE t2 (id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t VALUES (1);
    INSERT INTO t2 VALUES (7,1);
    UPDATE t2 SET tid = NULL WHERE id = 7;
    SELECT id, tid FROM t2;
} {7|}

do_execsql_test_in_memory_any_error fk-delete-parent-blocked {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t (id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE t2 (id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t VALUES (1,'x'),(2,'y');
    INSERT INTO t2 VALUES (10,2);
    DELETE FROM t WHERE id=2;
}

do_execsql_test_on_specific_db {:memory:} fk-delete-parent-ok-when-no-child {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t (id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE t2 (id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t VALUES (1,'x'),(2,'y');
    INSERT INTO t2 VALUES (10,1);
    DELETE FROM t WHERE id=2;
    SELECT id FROM t ORDER BY id;
} {1}


do_execsql_test_on_specific_db {:memory:} fk-composite-pk-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(
      a INT NOT NULL,
      b INT NOT NULL,
      PRIMARY KEY(a,b)
    );
    CREATE TABLE c(
      id INT PRIMARY KEY,
      x INT, y INT,
      FOREIGN KEY(x,y) REFERENCES p(a,b)
    );
    INSERT INTO p VALUES (1,1),(1,2);
    INSERT INTO c VALUES (10,1,1),(11,1,2),(12,NULL,2);  -- NULL in child allowed
    SELECT id,x,y FROM c ORDER BY id;
} {10|1|1
11|1|2
12||2}

do_execsql_test_in_memory_any_error fk-composite-pk-missing {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(
      a INT NOT NULL,
      b INT NOT NULL,
      PRIMARY KEY(a,b)
    );
    CREATE TABLE c(
      id INT PRIMARY KEY,
      x INT, y INT,
      FOREIGN KEY(x,y) REFERENCES p(a,b)
    );
    INSERT INTO p VALUES (1,1);
    INSERT INTO c VALUES (20,1,2);             -- (1,2) missing
}

do_execsql_test_in_memory_any_error fk-composite-update-child-missing {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
    CREATE TABLE c(id INT PRIMARY KEY, x INT, y INT,
                   FOREIGN KEY(x,y) REFERENCES p(a,b));
    INSERT INTO p VALUES (1,1),(2,2);
    INSERT INTO c VALUES (5,1,1);
    UPDATE c SET x=2,y=3 WHERE id=5;
}

do_execsql_test_on_specific_db {:memory:} fk-composite-unique-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE parent(u TEXT, v TEXT, pad INT, UNIQUE(u,v));
    CREATE TABLE child(id INT PRIMARY KEY, cu TEXT, cv TEXT,
                       FOREIGN KEY(cu,cv) REFERENCES parent(u,v));
    INSERT INTO parent VALUES ('A','B',0),('A','C',0);
    INSERT INTO child  VALUES (1,'A','B');
    SELECT id, cu, cv FROM child ORDER BY id;
} {1|A|B}

do_execsql_test_in_memory_any_error fk-composite-unique-missing {
    PRAGMA foreign_keys=ON;
    CREATE TABLE parent(u TEXT, v TEXT, pad INT, UNIQUE(u,v));
    CREATE TABLE child(id INT PRIMARY KEY, cu TEXT, cv TEXT,
                       FOREIGN KEY(cu,cv) REFERENCES parent(u,v));
    INSERT INTO parent VALUES ('A','B',0);
    INSERT INTO child  VALUES (2,'A','X');     -- no ('A','X') in parent
}

do_execsql_test_in_memory_any_error fk-rowid-alias-parent {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE c(cid INTEGER PRIMARY KEY, rid REFERENCES t(rowid));
    INSERT INTO t VALUES (100,'x');
    INSERT INTO c VALUES (1, 100);
}

do_execsql_test_in_memory_any_error fk-rowid-alias-parent-missing {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(id INTEGER PRIMARY KEY, a TEXT);
    CREATE TABLE c(cid INTEGER PRIMARY KEY, rid REFERENCES t(rowid));
    INSERT INTO c VALUES (1, 9999);
}

do_execsql_test_on_specific_db {:memory:} fk-update-child-noop-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(id INTEGER PRIMARY KEY);
    CREATE TABLE c(id INTEGER PRIMARY KEY, pid REFERENCES p(id));
    INSERT INTO p VALUES (1);
    INSERT INTO c VALUES (10,1);
    UPDATE c SET id = id WHERE id = 10;        -- no FK column touched
    SELECT id, pid FROM c;
} {10|1}

do_execsql_test_in_memory_any_error fk-delete-parent-composite-scan {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
    CREATE TABLE c(id INT PRIMARY KEY, x INT, y INT,
                   FOREIGN KEY(x,y) REFERENCES p(a,b));
    INSERT INTO p VALUES (1,2),(2,3);
    INSERT INTO c VALUES (7,2,3);
    DELETE FROM p WHERE a=2 AND b=3;
}

do_execsql_test_on_specific_db {:memory:} fk-update-child-to-existing-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(id INTEGER PRIMARY KEY);
    CREATE TABLE t2(id INTEGER PRIMARY KEY, tid REFERENCES t(id));
    INSERT INTO t VALUES (1),(2);
    INSERT INTO t2 VALUES (9,1);
    UPDATE t2 SET tid = 2 WHERE id = 9;
    SELECT id, tid FROM t2;
} {9|2}

do_execsql_test_on_specific_db {:memory:} fk-composite-pk-delete-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
  CREATE TABLE c(id INT PRIMARY KEY, x INT, y INT,
                 FOREIGN KEY(x,y) REFERENCES p(a,b));
  INSERT INTO p VALUES (1,2),(2,3);
  INSERT INTO c VALUES (7,2,3);
  -- Deleting a non-referenced parent tuple is OK
  DELETE FROM p WHERE a=1 AND b=2;
  SELECT a,b FROM p ORDER BY a,b;
} {2|3}

do_execsql_test_in_memory_any_error fk-composite-pk-delete-violate {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
  CREATE TABLE c(id INT PRIMARY KEY, x INT, y INT,
                 FOREIGN KEY(x,y) REFERENCES p(a,b));
  INSERT INTO p VALUES (2,3);
  INSERT INTO c VALUES (7,2,3);
  -- Deleting the referenced tuple should fail
  DELETE FROM p WHERE a=2 AND b=3;
}

# Parent columns omitted: should default to parent's declared PRIMARY KEY (composite)
do_execsql_test_on_specific_db {:memory:} fk-default-parent-pk-composite-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(
      a INT NOT NULL,
      b INT NOT NULL,
      PRIMARY KEY(a,b)
    );
    -- Parent columns omitted in REFERENCES p
    CREATE TABLE c(
      id INT PRIMARY KEY,
      x INT, y INT,
      FOREIGN KEY(x,y) REFERENCES p
    );
    INSERT INTO p VALUES (1,1), (1,2);
    INSERT INTO c VALUES (10,1,1), (11,1,2), (12,NULL,2);  -- NULL in child allowed
    SELECT id,x,y FROM c ORDER BY id;
} {10|1|1
11|1|2
12||2}

do_execsql_test_in_memory_any_error fk-default-parent-pk-composite-missing {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
    CREATE TABLE c(id INT PRIMARY KEY, x INT, y INT,
                   FOREIGN KEY(x,y) REFERENCES p);        -- omit parent cols
    INSERT INTO p VALUES (1,1);
    INSERT INTO c VALUES (20,1,2);                         -- (1,2) missing in parent
}

# Parent has no explicitly declared PK, so we throw parse error when referencing bare table
do_execsql_test_in_memory_any_error fk-default-parent-rowid-no-parent-pk {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p_no_pk(v TEXT);
    CREATE TABLE c_rowid(id INT PRIMARY KEY,
                         r REFERENCES p_no_pk);
    INSERT INTO p_no_pk(v) VALUES ('a'), ('b');
    INSERT INTO c_rowid VALUES (1, 1);
}

do_execsql_test_on_specific_db {:memory:} fk-parent-omit-cols-parent-has-pk {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p_pk(id INTEGER PRIMARY KEY, v TEXT);
  CREATE TABLE c_ok(id INT PRIMARY KEY, r REFERENCES p_pk);  -- binds to p_pk(id)
  INSERT INTO p_pk VALUES (1,'a'),(2,'b');
  INSERT INTO c_ok VALUES (10,1);
  INSERT INTO c_ok VALUES (11,2);
  SELECT id, r FROM c_ok ORDER BY id;
} {10|1 11|2}


# Self-reference (same table) with INTEGER PRIMARY KEY: single-row insert should pass
do_execsql_test_on_specific_db {:memory:} fk-self-ipk-single-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      id  INTEGER PRIMARY KEY,
      rid REFERENCES t(id)          -- child->parent in same table
    );
    INSERT INTO t(id,rid) VALUES(5,5);       -- self-reference, single-row
    SELECT id, rid FROM t;
} {5|5}

# Self-reference with mismatched value: should fail immediately (no counter semantics used)
do_execsql_test_in_memory_any_error fk-self-ipk-single-mismatch {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      id  INTEGER PRIMARY KEY,
      rid REFERENCES t(id)
    );
    INSERT INTO t(id,rid) VALUES(5,4);       -- rid!=id -> FK violation
}

# Self-reference on composite PRIMARY KEY: single-row insert should pass
do_execsql_test_on_specific_db {:memory:} fk-self-composite-single-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      a INT NOT NULL,
      b INT NOT NULL,
      x INT, 
      y INT,
      PRIMARY KEY(a,b),
      FOREIGN KEY(x,y) REFERENCES t(a,b)
    );
    INSERT INTO t(a,b,x,y) VALUES(1,2,1,2);  -- self-reference matches PK
    SELECT a,b,x,y FROM t;
} {1|2|1|2}

# Rowid parent path: text '10' must be coerced to integer (MustBeInt) and succeed
do_execsql_test_on_specific_db {:memory:} fk-rowid-mustbeint-coercion-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(id INTEGER PRIMARY KEY);
    CREATE TABLE c(cid INTEGER PRIMARY KEY, pid REFERENCES p(id));
    INSERT INTO p(id) VALUES(10);
    INSERT INTO c VALUES(1, '10');           -- text -> int via MustBeInt; should match
    SELECT pid FROM c;
} {10}

# Rowid parent path: non-numeric text cannot be coerced -> violation
do_execsql_test_in_memory_any_error fk-rowid-mustbeint-coercion-fail {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(id INTEGER PRIMARY KEY);
    CREATE TABLE c(cid INTEGER PRIMARY KEY, pid REFERENCES p(id));
    INSERT INTO p(id) VALUES(10);
    INSERT INTO c VALUES(2, 'abc'); -- MustBeInt fails to match any parent row
}

# Parent match via UNIQUE index (non-rowid), success path
do_execsql_test_on_specific_db {:memory:} fk-parent-unique-index-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE parent(u TEXT, v TEXT, pad INT, UNIQUE(u,v));
    CREATE TABLE child(id INT PRIMARY KEY, cu TEXT, cv TEXT,
                       FOREIGN KEY(cu,cv) REFERENCES parent(u,v));
    INSERT INTO parent VALUES ('A','B',0),('A','C',0);
    INSERT INTO child  VALUES (1,'A','B');
    SELECT id, cu, cv FROM child ORDER BY id;
} {1|A|B}

# Parent UNIQUE index path: missing key -> immediate violation
do_execsql_test_in_memory_any_error fk-parent-unique-index-missing {
    PRAGMA foreign_keys=ON;
    CREATE TABLE parent(u TEXT, v TEXT, pad INT, UNIQUE(u,v));
    CREATE TABLE child(id INT PRIMARY KEY, cu TEXT, cv TEXT,
                       FOREIGN KEY(cu,cv) REFERENCES parent(u,v));
    INSERT INTO parent VALUES ('A','B',0);
    INSERT INTO child  VALUES (2,'A','X');   -- no ('A','X') in parent
}

# NULL in child short-circuits FK check
do_execsql_test_on_specific_db {:memory:} fk-child-null-shortcircuit {
    PRAGMA foreign_keys=ON;
    CREATE TABLE p(id INTEGER PRIMARY KEY);
    CREATE TABLE c(id INTEGER PRIMARY KEY, pid REFERENCES p(id));
    INSERT INTO c VALUES (1, NULL);          -- NULL child is allowed
    SELECT id, pid FROM c;
} {1|}

do_execsql_test_on_specific_db {:memory:} fk-self-unique-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      u TEXT,
      v TEXT,
      cu TEXT,
      cv TEXT,
      UNIQUE(u,v),
      FOREIGN KEY(cu,cv) REFERENCES t(u,v)
    );
    -- Single row insert where child points to its own (u,v): allowed
    INSERT INTO t(u,v,cu,cv) VALUES('A','B','A','B');
    SELECT u, v, cu, cv FROM t;
} {A|B|A|B}

do_execsql_test_in_memory_any_error fk-self-unique-mismatch {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      u TEXT,
      v TEXT,
      cu TEXT,
      cv TEXT,
      UNIQUE(u,v),
      FOREIGN KEY(cu,cv) REFERENCES t(u,v)
    );
    -- Child points to a different (u,v) that doesn't exist: must fail
    INSERT INTO t(u,v,cu,cv) VALUES('A','B','A','X');
}

do_execsql_test_on_specific_db {:memory:} fk-self-unique-reference-existing-ok {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      u TEXT,
      v TEXT,
      cu TEXT,
      cv TEXT,
      UNIQUE(u,v),
      FOREIGN KEY(cu,cv) REFERENCES t(u,v)
    );
    -- Insert a parent row first
    INSERT INTO t(u,v,cu,cv) VALUES('P','Q',NULL,NULL);
    -- Now insert a row whose FK references the existing ('P','Q'): OK
    INSERT INTO t(u,v,cu,cv) VALUES('X','Y','P','Q');
    SELECT u, v, cu, cv FROM t ORDER BY u, v, cu, cv;
} {P|Q|| X|Y|P|Q}

do_execsql_test_on_specific_db {:memory:} fk-self-unique-multirow-no-fastpath {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(
      u TEXT,
      v TEXT,
      cu TEXT,
      cv TEXT,
      UNIQUE(u,v),
      FOREIGN KEY(cu,cv) REFERENCES t(u,v)
    );
    INSERT INTO t(u,v,cu,cv) VALUES
        ('C','D','C','D'),
        ('E','F','E','F');
} {}

do_execsql_test_in_memory_any_error fk-self-multirow-one-bad {
    PRAGMA foreign_keys=ON;
    CREATE TABLE t(id INTEGER PRIMARY KEY, rid INTEGER,
                   FOREIGN KEY(rid) REFERENCES t(id));
    INSERT INTO t(id,rid) VALUES (1,1),(3,99); -- 99 has no parent -> error
}

# doesnt fail because tx is un-committed
do_execsql_test_on_specific_db {:memory:} fk-deferred-commit-doesnt-fail-early {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 99); -- shouldnt fail because we are mid-tx
} {}

# it should fail here because we actuall COMMIT
do_execsql_test_in_memory_any_error fk-deferred-commit-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 99);
  COMMIT;
}


# If we fix it before COMMIT, COMMIT succeeds
do_execsql_test_on_specific_db {:memory:} fk-deferred-fix-before-commit-succeeds {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 99);   -- temporary violation
    INSERT INTO p VALUES(99);      -- fix parent
  COMMIT;
  SELECT * FROM p ORDER BY 1;
} {99}

#  ROLLBACK clears deferred state; a new tx can still fail if violation persists
do_execsql_test_on_specific_db {:memory:} fk-deferred-rollback-clears {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 123);
  ROLLBACK;

  -- Now start over and *fix* it, COMMIT should pass.
  BEGIN;
    INSERT INTO p VALUES(123);
    INSERT INTO c VALUES(1, 123);
  COMMIT;
  SELECT * FROM c ORDER BY 1;
} {1|123}


do_execsql_test_on_specific_db {:memory:} fk-deferred-insert-parent-fixes-before-commit {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 50); -- violation
    INSERT INTO p VALUES(50);    -- resolve
  COMMIT;
  SELECT * FROM c ORDER BY 1;
} {1|50}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-fixes-child-before-commit {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 50); -- violation
    INSERT INTO p VALUES(32);
	UPDATE c SET pid=32 WHERE id=1; -- resolve child
  COMMIT;
  SELECT * FROM c ORDER BY 1;
} {1|32}

do_execsql_test_on_specific_db {:memory:} fk-deferred-delete-fixes-child-before-commit {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 50); -- violation
    INSERT INTO p VALUES(32);
	DELETE FROM c WHERE id=1; -- resolve by deleting child
  COMMIT;
  SELECT * FROM c ORDER BY 1;
} {}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-fixes-parent-before-commit {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 50); -- violation
    INSERT INTO p VALUES(32);
	UPDATE p SET id=50 WHERE id=32; -- resolve via parent
  COMMIT;
  SELECT * FROM c ORDER BY 1;
} {1|50}

# Self-referential: row referencing itself should succeed
do_execsql_test_on_specific_db {:memory:} fk-deferred-self-ref-succeeds {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO t VALUES(1, 1);    -- self-match
  COMMIT;
  SELECT * FROM t ORDER BY 1;
} {1|1}

# Two-step self-ref: insert invalid, then create parent before COMMIT
do_execsql_test_on_specific_db {:memory:} fk-deferred-self-ref-late-parent {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO t VALUES(2, 3);  -- currently invalid
    INSERT INTO t VALUES(3, 3);  -- now parent exists
  COMMIT;
  SELECT * FROM t ORDER BY 1;
} {2|3
3|3}


# counter must not be neutralized by later good statements
do_execsql_test_in_memory_any_error fk-deferred-neutralize.1 {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent(id INTEGER PRIMARY KEY);
  CREATE TABLE parent_comp(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
  CREATE TABLE child_deferred(id INTEGER PRIMARY KEY, pid INT,
    FOREIGN KEY(pid) REFERENCES parent(id));

  CREATE TABLE child_comp_deferred(id INTEGER PRIMARY KEY, ca INT, cb INT,
    FOREIGN KEY(ca,cb) REFERENCES parent_comp(a,b));
  INSERT INTO parent_comp VALUES (4,-1);
  BEGIN;
    INSERT INTO child_deferred VALUES (1, 999);
    INSERT INTO child_comp_deferred VALUES (2, 4, -1);
  COMMIT;
}

do_execsql_test_on_specific_db {:memory:} fk-deferred-upsert-late-parent {
PRAGMA foreign_keys=ON;

CREATE TABLE p(id INTEGER PRIMARY KEY);
CREATE TABLE c(
  id  INTEGER PRIMARY KEY,
  pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
);

BEGIN;
  INSERT INTO c VALUES(1, 50);                 -- deferred violation
  INSERT INTO p VALUES(32);                    -- parent exists, but pid still 50
  INSERT INTO c(id,pid) VALUES(1,32)
    ON CONFLICT(id) DO UPDATE SET pid=excluded.pid;  -- resolve child via UPSERT
COMMIT;
-- Expect: row is (1,32) and no violations remain
SELECT * FROM c ORDER BY id;
} {1|32}

do_execsql_test_on_specific_db {:memory:} fk-deferred-upsert-late-child {
PRAGMA foreign_keys=ON;

CREATE TABLE p(
  id INTEGER PRIMARY KEY,
  u  INT UNIQUE
);
CREATE TABLE c(
  id  INTEGER PRIMARY KEY,
  pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
);
BEGIN;
  INSERT INTO c VALUES(1, 50);                 -- deferred violation (no parent 50)
  INSERT INTO p VALUES(32, 7);                 -- parent row with u=7
  -- Trigger DO UPDATE via conflict on p.u, then change the PK id to 50,
  -- which satisfies the child reference.
  INSERT INTO p(id,u) VALUES(999,7)
    ON CONFLICT(u) DO UPDATE SET id=50;
COMMIT;
-- Expect: parent is now (50,7), child (1,50), no violations remain
SELECT p.id, c.id FROM p  join c on c.pid = p.id;
} {50|1}

do_execsql_test_in_memory_any_error fk-deferred-insert-commit-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INTEGER REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 99);  -- no parent -> deferred violation
  COMMIT;                          -- must fail
}

do_execsql_test_on_specific_db {:memory:} fk-deferred-insert-parent-fix-before-commit {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id  INTEGER PRIMARY KEY,
    pid INTEGER REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO c VALUES(1, 99);   -- violation
    INSERT INTO p VALUES(99);      -- fix by inserting parent
  COMMIT;
  SELECT id, pid FROM c ORDER BY id;
} {1|99}

do_execsql_test_on_specific_db {:memory:} fk-deferred-insert-multi-children-one-parent-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 50);
    INSERT INTO c VALUES(2, 50);   -- two violations pointing to same parent
    INSERT INTO p VALUES(50);      -- one parent fixes both
  COMMIT;
  SELECT id, pid FROM c ORDER BY id;
} {1|50 2|50}

do_execsql_test_on_specific_db {:memory:} fk-deferred-insert-then-delete-child-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 77);   -- violation
    DELETE FROM c WHERE id=1;      -- resolve by removing the child
  COMMIT;
  SELECT count(*) FROM c;
} {0}

do_execsql_test_on_specific_db {:memory:} fk-deferred-insert-self-ref-succeeds {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED
  );
  BEGIN;
    INSERT INTO t VALUES(1, 1);    -- self-reference, legal at COMMIT
  COMMIT;
  SELECT id, pid FROM t;
} {1|1}

do_execsql_test_in_memory_any_error fk-deferred-update-child-breaks-commit-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  INSERT INTO c VALUES(1, 10);     -- valid
  BEGIN;
    UPDATE c SET pid=99 WHERE id=1;  -- create violation
  COMMIT;                             -- must fail
}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-child-fix-before-commit {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  INSERT INTO c VALUES(1, 10);
  BEGIN;
    UPDATE c SET pid=99 WHERE id=1;  -- violation
    UPDATE c SET pid=10 WHERE id=1;  -- fix child back
  COMMIT;
  SELECT id, pid FROM c;
} {1|10}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-child-fix-by-inserting-parent {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  INSERT INTO c VALUES(1, 10);
  BEGIN;
    UPDATE c SET pid=50 WHERE id=1;  -- violation
    INSERT INTO p VALUES(50);        -- fix by adding parent
  COMMIT;
  SELECT id, pid FROM c;
} {1|50}

do_execsql_test_in_memory_any_error fk-deferred-update-parent-breaks-commit-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(32);
  INSERT INTO c VALUES(1, 32);      -- valid
  BEGIN;
    UPDATE p SET id=50 WHERE id=32;  -- break child reference
  COMMIT;                            -- must fail (no fix)
}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-parent-fix-by-updating-child {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(32);
  INSERT INTO c VALUES(1, 32); 
  BEGIN;
    UPDATE p SET id=50 WHERE id=32;  -- break
    UPDATE c SET pid=50 WHERE id=1;  -- fix child to new parent key
  COMMIT;
  SELECT id, pid FROM c;
} {1|50}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-parent-fix-by-reverting-parent {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(32);
  INSERT INTO c VALUES(1, 32);
  BEGIN;
    UPDATE p SET id=50 WHERE id=32;  -- break
    UPDATE p SET id=32 WHERE id=50;  -- revert (fix)
  COMMIT;
  SELECT id, pid FROM c;
} {1|32}

do_execsql_test_on_specific_db {:memory:} fk-deferred-update-self-ref-id-change-and-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED
  );
  INSERT INTO t VALUES(1,1);
  BEGIN;
    UPDATE t SET id=2 WHERE id=1;   -- break self-ref
    UPDATE t SET pid=2 WHERE id=2;  -- fix to new self
  COMMIT;
  SELECT id, pid FROM t;
} {2|2}

do_execsql_test_in_memory_any_error fk-deferred-delete-parent-commit-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  INSERT INTO c VALUES(1, 10);      -- valid
  BEGIN;
    DELETE FROM p WHERE id=10;      -- break reference
  COMMIT;                            -- must fail
}

do_execsql_test_on_specific_db {:memory:} fk-deferred-delete-parent-then-delete-child-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  INSERT INTO c VALUES(1, 10);
  BEGIN;
    DELETE FROM p WHERE id=10;      -- break
    DELETE FROM c WHERE id=1;       -- fix by removing child
  COMMIT;
  SELECT count(*) FROM p, c;        -- both empty
} {0}

do_execsql_test_on_specific_db {:memory:} fk-deferred-delete-parent-then-reinsert-parent-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  INSERT INTO c VALUES(1, 10);
  BEGIN;
    DELETE FROM p WHERE id=10;      -- break
    INSERT INTO p VALUES(10);       -- fix by re-creating parent
  COMMIT;
  SELECT id, pid FROM c;
} {1|10}

do_execsql_test_on_specific_db {:memory:} fk-deferred-delete-self-ref-row-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(
    id  INTEGER PRIMARY KEY,
    pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED
  );
  INSERT INTO t VALUES(1,1);        -- valid
  BEGIN;
    DELETE FROM t WHERE id=1;       -- removes both child+parent (same row)
  COMMIT;                           -- should succeed
  SELECT count(*) FROM t;
} {0}

do_execsql_test_on_specific_db {:memory:} fk-deferred-delete-parent-then-update-child-to-null-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(
    id INTEGER PRIMARY KEY,
    pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED
  );
  INSERT INTO p VALUES(5);
  INSERT INTO c VALUES(1,5);
  BEGIN;
    DELETE FROM p WHERE id=5;       -- break
    UPDATE c SET pid=NULL WHERE id=1;  -- fix (NULL never violates)
  COMMIT;
  SELECT id, pid FROM c;
} {1|}

# AUTOCOMMIT: deferred FK still fails at end-of-statement
do_execsql_test_in_memory_any_error fk-deferred-autocommit-insert-missing-parent {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent(id INTEGER PRIMARY KEY);
  CREATE TABLE child(id INTEGER PRIMARY KEY, pid INT REFERENCES parent(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO child VALUES(1, 3);   -- no BEGIN; should fail at statement end
}

# AUTOCOMMIT: self-referential insert is OK (parent is same row)
do_execsql_test_on_specific_db {:memory:} fk-deferred-autocommit-selfref-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(id INTEGER PRIMARY KEY, pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO t VALUES(1,1);
  SELECT * FROM t;
} {1|1}

# AUTOCOMMIT: deleting a parent that has a child → fails at statement end
do_execsql_test_in_memory_any_error fk-deferred-autocommit-delete-parent-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(1);
  INSERT INTO c VALUES(10,1);
  DELETE FROM p WHERE id=1;   -- no BEGIN; should fail at statement end
}

# TX: delete a referenced parent then reinsert before COMMIT -> OK
do_execsql_test_on_specific_db {:memory:} fk-deferred-tx-delete-parent-then-reinsert-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(5);
  INSERT INTO c VALUES(1,5);
  BEGIN;
    DELETE FROM p WHERE id=5;  -- violation (deferred)
    INSERT INTO p VALUES(5);   -- fix in same tx
  COMMIT;
  SELECT count(*) FROM p WHERE id=5;
} {1}

# TX: multiple violating children, later insert parent, COMMIT -> OK
do_execsql_test_on_specific_db {:memory:} fk-deferred-tx-multi-children-fixed-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1,99);
    INSERT INTO c VALUES(2,99);
    INSERT INTO p VALUES(99);
  COMMIT;
  SELECT id,pid FROM c ORDER BY id;
} {1|99 2|99}

#  one of several children left unfixed -> COMMIT fails
do_execsql_test_in_memory_any_error fk-deferred-tx-multi-children-one-left-fails {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1,42);
    INSERT INTO c VALUES(2,42);
    INSERT INTO p VALUES(42);
    UPDATE c SET pid=777 WHERE id=2;  -- reintroduce a bad reference
  COMMIT;  -- should fail
}

# composite PK parent, fix via parent UPDATE before COMMIT -> OK
do_execsql_test_on_specific_db {:memory:} fk-deferred-composite-parent-update-fix {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent(a INT NOT NULL, b INT NOT NULL, PRIMARY KEY(a,b));
  CREATE TABLE child(id INT PRIMARY KEY, ca INT, cb INT,
    FOREIGN KEY(ca,cb) REFERENCES parent(a,b) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO parent VALUES(1,1);
  BEGIN;
    INSERT INTO child VALUES(10, 7, 7);        -- violation
    UPDATE parent SET a=7, b=7 WHERE a=1 AND b=1;  -- fix composite PK
  COMMIT;
  SELECT id, ca, cb FROM child;
} {10|7|7}

# TX: NULL in child FK -> never a violation
do_execsql_test_on_specific_db {:memory:} fk-deferred-null-fk-never-violates {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, NULL);  -- always OK
  COMMIT;
  SELECT id, pid FROM c;
} {1|}

# TX: child UPDATE to NULL resolves before COMMIT
do_execsql_test_on_specific_db {:memory:} fk-deferred-update-child-null-resolves {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 500);  -- violation
    UPDATE c SET pid=NULL WHERE id=1; -- resolves
  COMMIT;
  SELECT * FROM c;
} {1|}

# TX: delete violating child resolves before COMMIT
do_execsql_test_on_specific_db {:memory:} fk-deferred-delete-child-resolves {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 777);  -- violation
    DELETE FROM c WHERE id=1;      -- resolves
  COMMIT;
  SELECT count(*) FROM c;
} {0}

# TX: update parent PK to match child before COMMIT -> OK
do_execsql_test_on_specific_db {:memory:} fk-deferred-update-parent-pk-resolves {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO p VALUES(10);
  BEGIN;
    INSERT INTO c VALUES(1, 20);   -- violation
    UPDATE p SET id=20 WHERE id=10; -- resolve via parent
  COMMIT;
  SELECT * FROM c;
} {1|20}

# Two-table cycle; both inserted before COMMIT -> OK
do_execsql_test_on_specific_db {:memory:} fk-deferred-cycle-two-tables-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE a(id INT PRIMARY KEY, b_id INT, FOREIGN KEY(b_id) REFERENCES b(id) DEFERRABLE INITIALLY DEFERRED);
  CREATE TABLE b(id INT PRIMARY KEY, a_id INT, FOREIGN KEY(a_id) REFERENCES a(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO a VALUES(1, 1);  -- refers to b(1) (not yet present)
    INSERT INTO b VALUES(1, 1);  -- refers to a(1)
  COMMIT;
  SELECT count(b.id), count(a.id) FROM a, b;
} {1|1}

# Delete a row that self-references (child==parent) within a tx -> OK
do_execsql_test_on_specific_db {:memory:} fk-deferred-selfref-delete-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE t(id INTEGER PRIMARY KEY, pid INT REFERENCES t(id) DEFERRABLE INITIALLY DEFERRED);
  INSERT INTO t VALUES(1,1);
  BEGIN;
    DELETE FROM t WHERE id=1;
  COMMIT;
  SELECT count(*) FROM t;
} {0}


do_execsql_test_on_specific_db {:memory:} fk-parentcomp-donothing-noconflict-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent (id INTEGER PRIMARY KEY, a INT, b INT);
  CREATE TABLE child_deferred (
    id INTEGER PRIMARY KEY, pid INT, x INT,
    FOREIGN KEY(pid) REFERENCES parent(id) DEFERRABLE INITIALLY DEFERRED
  );
  CREATE TABLE parent_comp (a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));
  CREATE TABLE child_comp_deferred (
    id INTEGER PRIMARY KEY, ca INT, cb INT, z INT,
    FOREIGN KEY (ca,cb) REFERENCES parent_comp(a,b) DEFERRABLE INITIALLY DEFERRED
  );

  -- No conflict on (a,b); should insert 1 row, no FK noise
  INSERT INTO parent_comp VALUES (-1,-1,9) ON CONFLICT DO NOTHING;
  SELECT a,b,c FROM parent_comp ORDER BY a,b;
} {-1|-1|9}

do_execsql_test_on_specific_db {:memory:} fk-parentcomp-donothing-conflict-noop {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent_comp (a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));
  CREATE TABLE child_comp_deferred (
    id INTEGER PRIMARY KEY, ca INT, cb INT, z INT,
    FOREIGN KEY (ca,cb) REFERENCES parent_comp(a,b) DEFERRABLE INITIALLY DEFERRED
  );

  INSERT INTO parent_comp VALUES (10,20,1);
  -- Conflicts with existing (10,20); must do nothing (no triggers, no FK scans that mutate counters)
  INSERT INTO parent_comp VALUES (10,20,999) ON CONFLICT DO NOTHING;
  SELECT a,b,c FROM parent_comp;
} {10|20|1}

do_execsql_test_on_specific_db {:memory:} fk-parentcomp-donothing-unrelated-immediate-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent (id INTEGER PRIMARY KEY);
  CREATE TABLE child_immediate (
    id INTEGER PRIMARY KEY, pid INT,
    FOREIGN KEY(pid) REFERENCES parent(id)          -- IMMEDIATE
  );
  CREATE TABLE parent_comp (a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));
  CREATE TABLE child_comp_deferred (
    id INTEGER PRIMARY KEY, ca INT, cb INT, z INT,
    FOREIGN KEY(ca,cb) REFERENCES parent_comp(a,b) DEFERRABLE INITIALLY DEFERRED
  );

  INSERT INTO parent_comp VALUES (-1,-1,9) ON CONFLICT DO NOTHING;
  SELECT a,b,c FROM parent_comp;
} {-1|-1|9}

do_execsql_test_on_specific_db {:memory:} fk-parentcomp-deferred-fix-inside-tx-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent_comp (a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));
  CREATE TABLE child_comp_deferred (
    id INTEGER PRIMARY KEY, ca INT, cb INT,
    FOREIGN KEY(ca,cb) REFERENCES parent_comp(a,b) DEFERRABLE INITIALLY DEFERRED
  );

  BEGIN;
    INSERT INTO child_comp_deferred VALUES (1, -5, -6);  -- violation
    INSERT INTO parent_comp VALUES (-5, -6, 9);          -- fix via parent insert
  COMMIT;
  SELECT id,ca,cb FROM child_comp_deferred;
} {1|-5|-6}

do_execsql_test_on_specific_db {:memory:} fk-parentcomp-autocommit-unrelated-children-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent_comp (a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));
  CREATE TABLE child_comp_deferred (
    id INTEGER PRIMARY KEY, ca INT, cb INT,
    FOREIGN KEY(ca,cb) REFERENCES parent_comp(a,b) DEFERRABLE INITIALLY DEFERRED
  );

  INSERT INTO parent_comp VALUES (1,1,0);
  INSERT INTO child_comp_deferred VALUES (10,1,1);    -- valid
  INSERT INTO parent_comp VALUES (2,2,0) ON CONFLICT DO NOTHING;  -- unrelated insert; must not raise
  SELECT a,b,c FROM parent_comp ORDER BY a,b;
} {1|1|0
2|2|0}

# ROLLBACK must clear any deferred state; next statement must not trip.
do_execsql_test_on_specific_db {:memory:} fk-rollback-clears-then-donothing-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  CREATE TABLE parent_comp(a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));

  BEGIN;
    INSERT INTO c VALUES(1, 456);   -- create deferred violation
  ROLLBACK;                          -- must clear counters

  INSERT INTO parent_comp VALUES(-2,-2,0) ON CONFLICT DO NOTHING;
  SELECT a,b,c FROM parent_comp;
} {-2|-2|0}

# DO NOTHING conflict path must touch no FK maintenance at all.
do_execsql_test_on_specific_db {:memory:} fk-parentcomp-donothing-conflict-stays-quiet {
  PRAGMA foreign_keys=ON;
  CREATE TABLE parent_comp(a INT NOT NULL, b INT NOT NULL, c INT, PRIMARY KEY(a,b));
  CREATE TABLE child_comp_deferred(
    id INTEGER PRIMARY KEY, ca INT, cb INT,
    FOREIGN KEY(ca,cb) REFERENCES parent_comp(a,b) DEFERRABLE INITIALLY DEFERRED
  );

  INSERT INTO parent_comp VALUES(10,20,1);
  -- This conflicts with (10,20) and must be a no-op; if counters move here, it’s a bug.
  INSERT INTO parent_comp VALUES(10,20,999) ON CONFLICT DO NOTHING;

  -- Prove DB is sane afterwards (no stray FK error)
  INSERT INTO parent_comp VALUES(11,22,3) ON CONFLICT DO NOTHING;
  SELECT a,b FROM parent_comp ORDER BY a,b;
} {10|20
11|22}

# Two-statement fix inside an explicit transaction (separate statements).
#Insert child (violation), then insert parent in a new statement; commit must pass.
do_execsql_test_on_specific_db {:memory:} fk-deferred-two-stmt-fix-inside-tx-ok {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(id INTEGER PRIMARY KEY);
  CREATE TABLE c(id INTEGER PRIMARY KEY, pid INT REFERENCES p(id) DEFERRABLE INITIALLY DEFERRED);
  BEGIN;
    INSERT INTO c VALUES(1, 777);   -- violation recorded in tx
    INSERT INTO p VALUES(777);      -- next statement fixes it
  COMMIT;
  SELECT * FROM c;
} {1|777}

do_execsql_test_on_specific_db {:memory:} fk-delete-composite-bounds {
  PRAGMA foreign_keys=ON;
  CREATE TABLE p(a INT NOT NULL, b INT NOT NULL, v INT, PRIMARY KEY(a,b));
  CREATE TABLE c(id INTEGER PRIMARY KEY, x INT, y INT, w INT,
                 FOREIGN KEY(x,y) REFERENCES p(a,b));

  INSERT INTO p VALUES (5,1,0),(5,2,0),(5,4,0);
  INSERT INTO c VALUES (1,5,4,0);  -- child references (5,4)

  -- This should be a no-op (no row (5,3)), and MUST NOT error.
  DELETE FROM p WHERE a=5 AND b=3;
} {}